diff --git a/src/app/(frontend)/[locale]/support/faq/page.tsx b/src/app/(frontend)/[locale]/support/faq/page.tsx
index abea93c..006eebf 100644
--- a/src/app/(frontend)/[locale]/support/faq/page.tsx
+++ b/src/app/(frontend)/[locale]/support/faq/page.tsx
@@ -450,15 +450,21 @@ export default async function FAQPage({
       />
       <section className="relative aspect-[16/9] overflow-hidden bg-[linear-gradient(135deg,#f4f1eb_0%,#fbfaf7_52%,#e8e1d4_100%)] px-5 py-5 shadow-[0_18px_55px_rgba(23,23,23,0.05)] md:aspect-auto md:px-10 md:py-10">
         {heroImageUrl || heroMobileImageUrl ? (
-          <picture>
-            {heroMobileImageUrl ? <source media="(max-width: 767px)" srcSet={heroMobileImageUrl} /> : null}
+          <>
             <img
               src={heroImageUrl || heroMobileImageUrl || ''}
               alt=""
               className={['absolute inset-0 h-full w-full object-cover', heroOverlay ? 'opacity-100' : 'opacity-22'].join(' ')}
               decoding="async"
             />
-          </picture>
+            {heroImageUrl && heroMobileImageUrl ? (
+              <div
+                aria-hidden="true"
+                className={['absolute inset-0 h-full w-full bg-cover bg-center md:hidden', heroOverlay ? 'opacity-100' : 'opacity-22'].join(' ')}
+                style={{ backgroundImage: `url(${heroMobileImageUrl})` }}
+              />
+            ) : null}
+          </>
         ) : null}
         {heroOverlay ? (
           <div className="absolute inset-0 bg-[linear-gradient(135deg,rgba(0,0,0,0.72)_0%,rgba(0,0,0,0.46)_48%,rgba(0,0,0,0.22)_100%)]" />
diff --git a/src/app/Contributor/[...slug]/route.ts b/src/app/Contributor/[...slug]/route.ts
new file mode 100644
index 0000000..077d1c0
--- /dev/null
+++ b/src/app/Contributor/[...slug]/route.ts
@@ -0,0 +1,9 @@
+import type { NextRequest } from 'next/server'
+import { resolveCmsRedirect } from '@/lib/cms-redirect'
+
+export const dynamic = 'force-dynamic'
+export const revalidate = 0
+
+export async function GET(request: NextRequest) {
+  return resolveCmsRedirect({ request })
+}
diff --git a/src/app/Product/[section]/model/[model]/target/[target]/route.ts b/src/app/Product/[section]/model/[model]/target/[target]/route.ts
new file mode 100644
index 0000000..e1c55a0
--- /dev/null
+++ b/src/app/Product/[section]/model/[model]/target/[target]/route.ts
@@ -0,0 +1,80 @@
+import { NextRequest, NextResponse } from 'next/server'
+import { getPayloadClient } from '@/lib/payload'
+import { getSiteUrl } from '@/lib/seo'
+import { siteNotFoundRedirect } from '@/lib/site-not-found'
+
+export const dynamic = 'force-dynamic'
+export const revalidate = 0
+
+const legacyProductModelRedirects: Record<string, string> = {
+  'amp-f10': '/en/products/amp-f10',
+  'amp-f2': '/en/products/amp-f2',
+  'dac-z10': '/en/products/dac-z10',
+  'dac-z6': '/en/products/dac-z6',
+  'dac-z8': '/en/products/dac-z8',
+  'dmp-a10': '/en/products/dmp-a10',
+  'dmp-a6': '/en/products/dmp-a6-gen-2',
+  'dmp-a6 gen 2': '/en/products/dmp-a6-gen-2',
+  'dmp-a6 master edition': '/en/products/dmp-a6-master-gen-2',
+  'dmp-a6 master gen 2': '/en/products/dmp-a6-master-gen-2',
+  'dmp-a6 master+gen+2': '/en/products/dmp-a6-master-gen-2',
+  'dmp-a6+gen+2': '/en/products/dmp-a6-gen-2',
+  'dmp-a6+master+gen+2': '/en/products/dmp-a6-master-gen-2',
+  'eisa': '/en',
+  'eisa award winners': '/en',
+  'em-01': '/en/products/em-01',
+  'evotune™': '/en/products/evotune',
+  musicservices: '/en/products/musicservices',
+  play: '/en/products/play',
+  se100: '/en/products/se100',
+  t8: '/en/products/t8',
+  'topic-page': '/en/products/evotune',
+  v16: '/en/products/v16',
+  z10: '/en/products/dac-z10',
+}
+
+function normalizeLegacyModel(model: string) {
+  return decodeURIComponent(model).replace(/\+/g, ' ').trim().toLowerCase()
+}
+
+export async function GET(
+  request: NextRequest,
+  { params }: { params: Promise<{ model: string; section: string; target: string }> },
+) {
+  const { model } = await params
+  const payload = await getPayloadClient()
+
+  const rawPathname = request.nextUrl.pathname
+  const productIndexPath = rawPathname.replace(/^\/Product\/[^/]+\/model\//, '/Product/index/model/')
+
+  const redirects = await payload.find({
+    collection: 'redirects',
+    depth: 0,
+    limit: 2,
+    locale: 'en',
+    where: {
+      and: [
+        { enabled: { equals: true } },
+        {
+          or: [{ from: { equals: rawPathname } }, { from: { equals: productIndexPath } }],
+        },
+      ],
+    },
+  })
+
+  const redirectEntry =
+    redirects.docs.find((entry) => entry.from === rawPathname) ??
+    redirects.docs.find((entry) => entry.from === productIndexPath) ??
+    null
+
+  if (!redirectEntry?.to) {
+    const modelFallback = legacyProductModelRedirects[normalizeLegacyModel(model)]
+    if (modelFallback) {
+      return NextResponse.redirect(new URL(modelFallback, getSiteUrl()), 301)
+    }
+
+    return siteNotFoundRedirect()
+  }
+
+  return NextResponse.redirect(new URL(redirectEntry.to, getSiteUrl()), Number(redirectEntry.statusCode))
+}
diff --git a/src/app/Product/index/model/[model]/target/[target]/route.ts b/src/app/Product/index/model/[model]/target/[target]/route.ts
index 4cf90cf..b68c15b 100644
--- a/src/app/Product/index/model/[model]/target/[target]/route.ts
+++ b/src/app/Product/index/model/[model]/target/[target]/route.ts
@@ -1,9 +1,42 @@
 import { NextRequest, NextResponse } from 'next/server'
 import { getPayloadClient } from '@/lib/payload'
+import { getSiteUrl } from '@/lib/seo'
+import { siteNotFoundRedirect } from '@/lib/site-not-found'
 
 export const dynamic = 'force-dynamic'
 export const revalidate = 0
 
+const legacyProductModelRedirects: Record<string, string> = {
+  'amp-f10': '/en/products/amp-f10',
+  'amp-f2': '/en/products/amp-f2',
+  'dac-z10': '/en/products/dac-z10',
+  'dac-z6': '/en/products/dac-z6',
+  'dac-z8': '/en/products/dac-z8',
+  'dmp-a10': '/en/products/dmp-a10',
+  'dmp-a6': '/en/products/dmp-a6-gen-2',
+  'dmp-a6 gen 2': '/en/products/dmp-a6-gen-2',
+  'dmp-a6 master edition': '/en/products/dmp-a6-master-gen-2',
+  'dmp-a6 master gen 2': '/en/products/dmp-a6-master-gen-2',
+  'dmp-a6 master+gen+2': '/en/products/dmp-a6-master-gen-2',
+  'dmp-a6+gen+2': '/en/products/dmp-a6-gen-2',
+  'dmp-a6+master+gen+2': '/en/products/dmp-a6-master-gen-2',
+  'eisa': '/en',
+  'eisa award winners': '/en',
+  'em-01': '/en/products/em-01',
+  'evotune™': '/en/products/evotune',
+  musicservices: '/en/products/musicservices',
+  play: '/en/products/play',
+  se100: '/en/products/se100',
+  t8: '/en/products/t8',
+  'topic-page': '/en/products/evotune',
+  v16: '/en/products/v16',
+  z10: '/en/products/dac-z10',
+}
+
+function normalizeLegacyModel(model: string) {
+  return decodeURIComponent(model).replace(/\+/g, ' ').trim().toLowerCase()
+}
+
 export async function GET(
   request: NextRequest,
   { params }: { params: Promise<{ model: string; target: string }> },
@@ -11,7 +44,7 @@ export async function GET(
   const { model, target } = await params
   const payload = await getPayloadClient()
 
-  const rawPathname = new URL(request.url).pathname
+  const rawPathname = request.nextUrl.pathname
   const fallbackPath = `/Product/index/model/${model}/target/${target}`
 
   const redirects = await payload.find({
@@ -35,8 +68,13 @@ export async function GET(
     null
 
   if (!redirectEntry?.to) {
-    return NextResponse.json({ error: 'Redirect not found' }, { status: 404 })
+    const modelFallback = legacyProductModelRedirects[normalizeLegacyModel(model)]
+    if (modelFallback) {
+      return NextResponse.redirect(new URL(modelFallback, getSiteUrl()), 301)
+    }
+
+    return siteNotFoundRedirect()
   }
 
-  return NextResponse.redirect(new URL(redirectEntry.to, request.url), Number(redirectEntry.statusCode))
+  return NextResponse.redirect(new URL(redirectEntry.to, getSiteUrl()), Number(redirectEntry.statusCode))
 }
diff --git a/src/app/Support/[...slug]/route.ts b/src/app/Support/[...slug]/route.ts
new file mode 100644
index 0000000..e953195
--- /dev/null
+++ b/src/app/Support/[...slug]/route.ts
@@ -0,0 +1,17 @@
+import type { NextRequest } from 'next/server'
+import { resolveCmsRedirect } from '@/lib/cms-redirect'
+
+export const dynamic = 'force-dynamic'
+export const revalidate = 0
+
+export async function GET(request: NextRequest) {
+  const pathname = request.nextUrl.pathname
+  const normalizedTutorialPage = pathname.match(/^\/Support\/tutorial\/target\/([^/]+)\/p\/\d+\.html$/)
+
+  return resolveCmsRedirect({
+    pathname: normalizedTutorialPage
+      ? `/Support/tutorial/target/${normalizedTutorialPage[1]}.html`
+      : undefined,
+    request,
+  })
+}
diff --git a/src/app/api/media-assets/archive/[id]/route.ts b/src/app/api/media-assets/archive/[id]/route.ts
index 4de989e..512088f 100644
--- a/src/app/api/media-assets/archive/[id]/route.ts
+++ b/src/app/api/media-assets/archive/[id]/route.ts
@@ -1,5 +1,6 @@
 import { NextRequest, NextResponse } from 'next/server'
 import { getPayloadClient } from '@/lib/payload'
+import { getSiteUrl } from '@/lib/seo'
 
 function cleanFilenamePart(value: string | null | undefined, fallback: string) {
   const cleaned = value
@@ -39,9 +40,9 @@ function contentDisposition(filename: string) {
   return `attachment; filename="${ascii}"; filename*=UTF-8''${encodeURIComponent(filename)}`
 }
 
-function resolveDownloadUrl(value: string, request: NextRequest) {
+function resolveDownloadUrl(value: string) {
   const trimmed = value.trim()
-  if (trimmed.startsWith('/')) return new URL(trimmed, request.url).toString()
+  if (trimmed.startsWith('/')) return new URL(trimmed, getSiteUrl()).toString()
 
   const parsed = new URL(trimmed)
   if (parsed.protocol !== 'http:' && parsed.protocol !== 'https:') {
@@ -51,8 +52,8 @@ function resolveDownloadUrl(value: string, request: NextRequest) {
   return parsed.toString()
 }
 
-async function proxyAttachment(url: string, filename: string, request: NextRequest) {
-  const resolvedUrl = resolveDownloadUrl(url, request)
+async function proxyAttachment(url: string, filename: string) {
+  const resolvedUrl = resolveDownloadUrl(url)
   const upstream = await fetch(resolvedUrl, {
     cache: 'no-store',
     headers: {
@@ -79,7 +80,7 @@ async function proxyAttachment(url: string, filename: string, request: NextReque
 }
 
 export async function GET(
-  request: NextRequest,
+  _request: NextRequest,
   { params }: { params: Promise<{ id: string }> },
 ) {
   const { id } = await params
@@ -98,6 +99,5 @@ export async function GET(
   return proxyAttachment(
     category.archiveDownloadUrl,
     buildFilename(category.name, category.archiveFormat),
-    request,
   )
 }
diff --git a/src/app/api/media-assets/download/[id]/route.ts b/src/app/api/media-assets/download/[id]/route.ts
index d63a679..1c24782 100644
--- a/src/app/api/media-assets/download/[id]/route.ts
+++ b/src/app/api/media-assets/download/[id]/route.ts
@@ -1,5 +1,6 @@
 import { NextRequest, NextResponse } from 'next/server'
 import { getPayloadClient } from '@/lib/payload'
+import { getSiteUrl } from '@/lib/seo'
 
 function cleanFilenamePart(value: string | null | undefined, fallback: string) {
   const cleaned = value
@@ -39,9 +40,9 @@ function contentDisposition(filename: string) {
   return `attachment; filename="${ascii}"; filename*=UTF-8''${encodeURIComponent(filename)}`
 }
 
-function resolveDownloadUrl(value: string, request: NextRequest) {
+function resolveDownloadUrl(value: string) {
   const trimmed = value.trim()
-  if (trimmed.startsWith('/')) return new URL(trimmed, request.url).toString()
+  if (trimmed.startsWith('/')) return new URL(trimmed, getSiteUrl()).toString()
 
   const parsed = new URL(trimmed)
   if (parsed.protocol !== 'http:' && parsed.protocol !== 'https:') {
@@ -51,8 +52,8 @@ function resolveDownloadUrl(value: string, request: NextRequest) {
   return parsed.toString()
 }
 
-async function proxyAttachment(url: string, filename: string, request: NextRequest) {
-  const resolvedUrl = resolveDownloadUrl(url, request)
+async function proxyAttachment(url: string, filename: string) {
+  const resolvedUrl = resolveDownloadUrl(url)
   const upstream = await fetch(resolvedUrl, {
     cache: 'no-store',
     headers: {
@@ -79,7 +80,7 @@ async function proxyAttachment(url: string, filename: string, request: NextReque
 }
 
 export async function GET(
-  request: NextRequest,
+  _request: NextRequest,
   { params }: { params: Promise<{ id: string }> },
 ) {
   const { id } = await params
@@ -95,5 +96,5 @@ export async function GET(
     return NextResponse.json({ error: 'Download not found.' }, { status: 404 })
   }
 
-  return proxyAttachment(asset.externalUrl, buildFilename(asset.title, asset.fileFormat), request)
+  return proxyAttachment(asset.externalUrl, buildFilename(asset.title, asset.fileFormat))
 }
diff --git a/src/components/site/page-hero.tsx b/src/components/site/page-hero.tsx
index c7f8505..5ac5fc9 100644
--- a/src/components/site/page-hero.tsx
+++ b/src/components/site/page-hero.tsx
@@ -96,20 +96,27 @@ export function PageHero({
   const contentPadding = size === 'tall' ? 'px-5 pb-6 pt-12 md:px-12 md:pb-14 md:pt-24' : 'px-5 py-5 md:px-10 md:py-10'
   const titleSize = size === 'tall' ? 'text-2xl sm:text-3xl md:text-5xl' : 'text-2xl sm:text-3xl md:text-5xl'
   const resolvedImageUrl = imageUrl || mobileImageUrl
+  const hasMobileFallback = Boolean(imageUrl && mobileImageUrl)
 
   return (
     <section className={['overflow-hidden rounded-[24px]', overlay ? 'bg-black text-white' : 'bg-white text-text-primary'].join(' ')}>
       <div className={['relative aspect-[16/9] md:aspect-auto', outerMinHeight].join(' ')}>
         {resolvedImageUrl ? (
-          <picture>
-            {mobileImageUrl ? <source media="(max-width: 767px)" srcSet={mobileImageUrl} /> : null}
+          <>
             <img
               src={resolvedImageUrl}
               alt=""
               className="absolute inset-0 h-full w-full object-cover"
               decoding="async"
             />
-          </picture>
+            {hasMobileFallback ? (
+              <div
+                aria-hidden="true"
+                className="absolute inset-0 h-full w-full bg-cover bg-center md:hidden"
+                style={{ backgroundImage: `url(${mobileImageUrl})` }}
+              />
+            ) : null}
+          </>
         ) : null}
         {overlay ? (
           <div className="absolute inset-0 bg-[linear-gradient(135deg,rgba(0,0,0,0.72)_0%,rgba(0,0,0,0.45)_48%,rgba(0,0,0,0.2)_100%)]" />
diff --git a/src/lib/cms-redirect.ts b/src/lib/cms-redirect.ts
index 701c286..912d522 100644
--- a/src/lib/cms-redirect.ts
+++ b/src/lib/cms-redirect.ts
@@ -1,5 +1,7 @@
 import { NextRequest, NextResponse } from 'next/server'
 import { getPayloadClient } from '@/lib/payload'
+import { getSiteUrl } from '@/lib/seo'
+import { siteNotFoundRedirect } from '@/lib/site-not-found'
 
 type ResolveCmsRedirectOptions = {
   locale?: 'any' | 'en' | 'zh'
@@ -13,7 +15,7 @@ function isSafeRedirectTarget(value: string) {
 
 export async function resolveCmsRedirect({ locale = 'any', pathname, request }: ResolveCmsRedirectOptions) {
   const payload = await getPayloadClient()
-  const rawPathname = pathname ?? new URL(request.url).pathname
+  const rawPathname = pathname ?? request.nextUrl.pathname
 
   const redirects = await payload.find({
     collection: 'redirects',
@@ -38,8 +40,8 @@ export async function resolveCmsRedirect({ locale = 'any', pathname, request }:
   const redirectEntry = redirects.docs[0]
 
   if (!redirectEntry?.to || !isSafeRedirectTarget(redirectEntry.to)) {
-    return NextResponse.json({ error: 'Redirect not found' }, { status: 404 })
+    return siteNotFoundRedirect(locale === 'zh' ? 'zh' : 'en')
   }
 
-  return NextResponse.redirect(new URL(redirectEntry.to, request.url), Number(redirectEntry.statusCode))
+  return NextResponse.redirect(new URL(redirectEntry.to, getSiteUrl()), Number(redirectEntry.statusCode))
 }
diff --git a/src/lib/site-not-found.ts b/src/lib/site-not-found.ts
new file mode 100644
index 0000000..194b665
--- /dev/null
+++ b/src/lib/site-not-found.ts
@@ -0,0 +1,8 @@
+import { NextResponse } from 'next/server'
+import { getSiteUrl } from '@/lib/seo'
+
+export function siteNotFoundRedirect(locale: 'en' | 'zh' = 'en') {
+  const response = NextResponse.redirect(new URL(`/${locale}/404`, getSiteUrl()), 307)
+  response.headers.set('Cache-Control', 'no-store, max-age=0')
+  return response
+}
diff --git a/src/lib/static-file-response.ts b/src/lib/static-file-response.ts
index 5447d03..1bdd9cc 100644
--- a/src/lib/static-file-response.ts
+++ b/src/lib/static-file-response.ts
@@ -11,7 +11,7 @@ type ServeStaticFileOptions = {
   headOnly?: boolean
   parts: string[]
   request: Request
-  root: string
+  root: string | string[]
 }
 
 type ByteRange = {
@@ -44,6 +44,15 @@ async function resolveExistingFile(root: string, requestedPath: string) {
   }
 }
 
+async function resolveExistingFileFromRoots(roots: string | string[], requestedPath: string) {
+  for (const root of Array.isArray(roots) ? roots : [roots]) {
+    const filePath = await resolveExistingFile(root, requestedPath)
+    if (filePath) return filePath
+  }
+
+  return null
+}
+
 function parseRangeHeader(value: string | null, size: number): ByteRange | 'invalid' | null {
   if (!value) return null
   const match = /^bytes=(\d*)-(\d*)$/.exec(value.trim())
@@ -119,53 +128,59 @@ export async function serveStaticFile({
   request,
   root,
 }: ServeStaticFileOptions) {
-  const requestedPath = parts.join('/')
-  const filePath = await resolveExistingFile(root, requestedPath)
-  if (!filePath) return new Response('Not Found', { status: 404 })
+  const notFound = () => new Response(headOnly ? null : 'Not Found', { status: 404 })
 
-  const stats = await fs.stat(filePath)
-  if (!stats.isFile()) return new Response('Not Found', { status: 404 })
+  try {
+    const requestedPath = parts.join('/')
+    const filePath = await resolveExistingFileFromRoots(root, requestedPath)
+    if (!filePath) return notFound()
 
-  const etag = `W/"${stats.size}-${Math.floor(stats.mtimeMs)}"`
-  const lastModified = stats.mtime.toUTCString()
-  const headers = createBaseHeaders({
-    contentDisposition: contentDisposition?.(filePath),
-    contentType: contentType(filePath),
-    etag,
-    lastModified,
-  })
-  const range = parseRangeHeader(request.headers.get('range'), stats.size)
+    const stats = await fs.stat(filePath)
+    if (!stats.isFile()) return notFound()
 
-  if (range === 'invalid') {
-    return new Response(null, {
-      headers: {
-        'Content-Range': `bytes */${stats.size}`,
-      },
-      status: 416,
+    const etag = `W/"${stats.size}-${Math.floor(stats.mtimeMs)}"`
+    const lastModified = stats.mtime.toUTCString()
+    const headers = createBaseHeaders({
+      contentDisposition: contentDisposition?.(filePath),
+      contentType: contentType(filePath),
+      etag,
+      lastModified,
     })
-  }
+    const range = parseRangeHeader(request.headers.get('range'), stats.size)
 
-  if (!range && isFresh(request, etag, stats.mtimeMs)) {
-    return new Response(null, {
+    if (range === 'invalid') {
+      return new Response(null, {
+        headers: {
+          'Content-Range': `bytes */${stats.size}`,
+        },
+        status: 416,
+      })
+    }
+
+    if (!range && isFresh(request, etag, stats.mtimeMs)) {
+      return new Response(null, {
+        headers,
+        status: 304,
+      })
+    }
+
+    if (range) {
+      headers.set('Content-Length', String(range.end - range.start + 1))
+      headers.set('Content-Range', `bytes ${range.start}-${range.end}/${stats.size}`)
+
+      return new Response(headOnly ? null : toWebStream(filePath, range), {
+        headers,
+        status: 206,
+      })
+    }
+
+    headers.set('Content-Length', String(stats.size))
+
+    return new Response(headOnly ? null : toWebStream(filePath), {
       headers,
-      status: 304,
+      status: 200,
     })
+  } catch {
+    return notFound()
   }
-
-  if (range) {
-    headers.set('Content-Length', String(range.end - range.start + 1))
-    headers.set('Content-Range', `bytes ${range.start}-${range.end}/${stats.size}`)
-
-    return new Response(headOnly ? null : toWebStream(filePath, range), {
-      headers,
-      status: 206,
-    })
-  }
-
-  headers.set('Content-Length', String(stats.size))
-
-  return new Response(headOnly ? null : toWebStream(filePath), {
-    headers,
-    status: 200,
-  })
 }
diff --git a/src/middleware.ts b/src/middleware.ts
index 166c623..09758ab 100644
--- a/src/middleware.ts
+++ b/src/middleware.ts
@@ -2,6 +2,7 @@ import createMiddleware from 'next-intl/middleware'
 import type { NextRequest } from 'next/server'
 import { NextResponse } from 'next/server'
 import { defaultLocale, locales } from './i18n/config'
+import { getSiteUrl } from './lib/seo'
 
 const intlMiddleware = createMiddleware({
   locales: [...locales],
@@ -39,7 +40,7 @@ export default function middleware(request: NextRequest) {
 
   if (!hasLocalePrefix) {
     const locale = shouldUseSimplifiedChinese(request) ? 'zh' : 'en'
-    const url = request.nextUrl.clone()
+    const url = new URL(request.nextUrl.pathname, getSiteUrl())
     url.pathname = `/${locale}${pathname === '/' ? '' : pathname}`
     url.search = search
     return NextResponse.redirect(url)