diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7fd1a8a5..39f365bd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,41 @@
+## [7.73.1](https://github.com/kaitranntt/ccs/compare/v7.73.0...v7.73.1) (2026-04-22)
+
+### Hotfixes
+
+* **cliproxy:** fallback from deleted CLIProxyAPIPlus to original backend ([60cbdce](https://github.com/kaitranntt/ccs/commit/60cbdce83dd429aeb6df5f1439ba99edd96acc3a)), closes [#1062](https://github.com/kaitranntt/ccs/issues/1062)
+* close cliproxy plus fallback gaps ([7b1a7f3](https://github.com/kaitranntt/ccs/commit/7b1a7f3a09b5c6394897b5f95ad32bc9109e6a21))
+* preserve plus fallback state and guard variant updates ([5b5f4a5](https://github.com/kaitranntt/ccs/commit/5b5f4a5ef52f91cb6d4bc7fd3413eac714945d4a))
+
+## [7.73.0](https://github.com/kaitranntt/ccs/compare/v7.72.1...v7.73.0) (2026-04-19)
+
+### Features
+
+* **proxy:** enhance Anthropic-to-OpenAI message transformation and schema sanitization ([2672e35](https://github.com/kaitranntt/ccs/commit/2672e35362938b054710de681760bd24c3c39e19))
+
+### Bug Fixes
+
+* **browser:** bootstrap managed attach profile setup ([b525033](https://github.com/kaitranntt/ccs/commit/b52503300b0c434fbb9d88283643d3ceaa673d44))
+* **cliproxy:** preserve legacy openai-compat connectors on restart ([16f81fc](https://github.com/kaitranntt/ccs/commit/16f81fc8a595792f1c1a6df060f88cdf28d7afb6))
+* **codex:** probe Windows cmd wrappers via cmd shell ([210ec33](https://github.com/kaitranntt/ccs/commit/210ec33c04fe88be2b651c2163f638085b1b6bd2))
+* **proxy:** harden Anthropic request transformation semantics ([ebc9219](https://github.com/kaitranntt/ccs/commit/ebc92194bb9bf2810e10f64de1fa6e599c2fa156))
+* **proxy:** preserve valid enums during schema normalization ([22ab58b](https://github.com/kaitranntt/ccs/commit/22ab58b02e5dc34f152ecce048c1fbf7d615bdfb))
+* **proxy:** restore strict Anthropic message validation ([32d6bfd](https://github.com/kaitranntt/ccs/commit/32d6bfdda7881a42a376d0973c021f0b47eed7e2))
+* **repo:** remove tracked plans workspace files ([bc4ab98](https://github.com/kaitranntt/ccs/commit/bc4ab98af41e9c9f049cc5da2e6ff356832ef14b))
+* **targets:** use cmd.exe for escaped Windows wrapper launches ([a945b0b](https://github.com/kaitranntt/ccs/commit/a945b0b1047b85a7b343dfe35d8ae9680346e25f))
+* **windows:** align escaped wrapper shell handling ([ccdd0b6](https://github.com/kaitranntt/ccs/commit/ccdd0b6e8e4185ec2b01186cfc69e28f171d0906))
+
+### Tests
+
+* **cliproxy:** assert routing persistence via unified config loader ([485fe4b](https://github.com/kaitranntt/ccs/commit/485fe4ba1c5878083c6e2b6a2d98b37208772a1f))
+* **cliproxy:** cover legacy connector removal cleanup ([00d902b](https://github.com/kaitranntt/ccs/commit/00d902b6e64839cd6b89446cc5dee540f2a059b8))
+* **cliproxy:** isolate routing strategy service state ([5e1e807](https://github.com/kaitranntt/ccs/commit/5e1e8070e821dbe660ea77bc96fec610937ed44a))
+* **websearch:** clear CCS_PROFILE_TYPE in SearXNG fallback spawn env ([e25d791](https://github.com/kaitranntt/ccs/commit/e25d791d9bee38e7143757d37c42bd850e471ae8))
+
+### CI
+
+* add concurrency group and split build/test with artifact sharing ([ad54e17](https://github.com/kaitranntt/ccs/commit/ad54e179b6a3921fd26ad3ac585f5ef965b01c1b))
+* **pre-push:** skip gate for delete-only pushes ([6236cb7](https://github.com/kaitranntt/ccs/commit/6236cb7feb15e954f7f65ae98e6fd98b323a4adb))
+
 ## [7.72.1](https://github.com/kaitranntt/ccs/compare/v7.72.0...v7.72.1) (2026-04-17)
 
 ### Bug Fixes
diff --git a/src/cliproxy/binary-manager.ts b/src/cliproxy/binary-manager.ts
index c400a3dc..95c486b3 100644
--- a/src/cliproxy/binary-manager.ts
+++ b/src/cliproxy/binary-manager.ts
@@ -5,10 +5,17 @@
  * Pattern: Mirrors npm install behavior (fast check, download only when needed)
  */
 
+import * as fs from 'fs';
+import * as path from 'path';
 import { info, warn } from '../utils/ui';
 import { getBinDir, CLIPROXY_DEFAULT_PORT } from './config-generator';
 import { BinaryInfo, BinaryManagerConfig } from './types';
-import { BACKEND_CONFIG, DEFAULT_BACKEND, CLIPROXY_MAX_STABLE_VERSION } from './platform-detector';
+import {
+  BACKEND_CONFIG,
+  DEFAULT_BACKEND,
+  CLIPROXY_MAX_STABLE_VERSION,
+  getExecutableName,
+} from './platform-detector';
 import { stopProxy } from './services/proxy-lifecycle-service';
 import { waitForPortFree } from '../utils/port-utils';
 import { loadOrCreateUnifiedConfig } from '../config/unified-config-loader';
@@ -16,6 +23,7 @@ import {
   UpdateCheckResult,
   checkForUpdates,
   deleteBinary,
+  getVersionCachePath,
   getBinaryPath,
   isBinaryInstalled,
   getBinaryInfo,
@@ -30,10 +38,31 @@ import {
 } from './binary';
 
 import type { CLIProxyBackend } from './types';
+import { getVersionListCachePath } from './binary/version-cache';
 
+export const CLIPROXY_DELETED_PLUS_REPO = 'router-for-me/CLIProxyAPIPlus';
+export const CLIPROXY_PLUS_FALLBACK_TRACKING_URL = 'https://github.com/kaitranntt/ccs/issues/1062';
 export const CLIPROXY_PLUS_FORK_URL = 'https://github.com/kaitranntt/CLIProxyAPIPlus';
 export const CLIPROXY_PLUS_TRACKING_URL = 'https://github.com/kaitranntt/ccs/issues/1065';
 
+/**
+ * Track whether we've already warned the user about the legacy Plus fallback
+ * this process lifetime. Prevents spamming the warning on every command.
+ */
+let plusFallbackWarned = false;
+
+function emitPlusFallbackWarning(): void {
+  if (plusFallbackWarned) return;
+  plusFallbackWarned = true;
+  process.stderr.write(
+    `${warn(
+      'Legacy CLIProxyAPIPlus upstream repo is unavailable; local CLIProxy is falling back to ' +
+        '`backend: original`. Run `ccs config` to use the maintained Plus fork. ' +
+        `Tracking: ${CLIPROXY_PLUS_FALLBACK_TRACKING_URL}`
+    )}\n`
+  );
+}
+
 /**
  * Track whether we've already shown the optional Plus backend notice this
  * process lifetime. Prevents spamming the message on every command.
@@ -66,13 +95,50 @@ export function getPlusBackendUnavailableMessage(provider?: string): string {
 
 interface ResolveLocalBackendOptions {
   notifyOnPlus?: boolean;
+  warnOnFallback?: boolean;
+}
+
+function isPlusBackendFallbackActive(): boolean {
+  return (BACKEND_CONFIG.plus.repo as string) === CLIPROXY_DELETED_PLUS_REPO;
+}
+
+function copyFallbackStateIfMissing(sourcePath: string, targetPath: string): void {
+  if (!fs.existsSync(sourcePath) || fs.existsSync(targetPath)) return;
+  fs.mkdirSync(path.dirname(targetPath), { recursive: true });
+  fs.copyFileSync(sourcePath, targetPath);
+}
+
+export function syncPlusFallbackStateIfNeeded(configuredBackend: CLIProxyBackend): void {
+  if (configuredBackend !== 'plus' || !isPlusBackendFallbackActive()) return;
+
+  const plusDir = getBackendBinDir('plus');
+  const originalDir = getBackendBinDir('original');
+
+  copyFallbackStateIfMissing(
+    path.join(plusDir, getExecutableName('plus')),
+    path.join(originalDir, getExecutableName('original'))
+  );
+  copyFallbackStateIfMissing(path.join(plusDir, '.version'), path.join(originalDir, '.version'));
+  copyFallbackStateIfMissing(getVersionPinPath('plus'), getVersionPinPath('original'));
+  copyFallbackStateIfMissing(getVersionCachePath('plus'), getVersionCachePath('original'));
+  copyFallbackStateIfMissing(getVersionListCachePath('plus'), getVersionListCachePath('original'));
 }
 
 export function resolveLocalBackend(
   backend: CLIProxyBackend = DEFAULT_BACKEND,
   options: ResolveLocalBackendOptions = {}
 ): CLIProxyBackend {
-  if (backend === 'plus' && options.notifyOnPlus) {
+  if (backend !== 'plus') return backend;
+
+  if (isPlusBackendFallbackActive()) {
+    syncPlusFallbackStateIfNeeded(backend);
+    if (options.warnOnFallback) {
+      emitPlusFallbackWarning();
+    }
+    return 'original';
+  }
+
+  if (options.notifyOnPlus) {
     emitPlusBackendInfo();
   }
   return backend;
diff --git a/tests/unit/cliproxy/binary-manager-install.test.ts b/tests/unit/cliproxy/binary-manager-install.test.ts
index 8240c1e9..dfe781f5 100644
--- a/tests/unit/cliproxy/binary-manager-install.test.ts
+++ b/tests/unit/cliproxy/binary-manager-install.test.ts
@@ -100,6 +100,44 @@ describe('installCliproxyVersion', () => {
     expect(status.binaryPath).toContain('/plus/');
   });
 
+  it('copies plus binary and pin state when legacy deleted upstream fallback is active', async () => {
+    const { createEmptyUnifiedConfig } = await import('../../../src/config/unified-config-types');
+    const { saveUnifiedConfig } = await import('../../../src/config/unified-config-loader');
+    const { savePinnedVersion } = await import('../../../src/cliproxy/binary/version-cache');
+    const platformDetector = await import('../../../src/cliproxy/platform-detector');
+    const binaryService = await import(
+      `../../../src/cliproxy/services/binary-service?binary-service-legacy-plus-fallback=${Date.now()}`
+    );
+
+    const plusConfig = platformDetector.BACKEND_CONFIG.plus as unknown as { repo: string };
+    const originalRepo = plusConfig.repo;
+
+    try {
+      plusConfig.repo = 'router-for-me/CLIProxyAPIPlus';
+
+      const config = createEmptyUnifiedConfig();
+      config.cliproxy = { ...config.cliproxy, backend: 'plus' };
+      saveUnifiedConfig(config);
+
+      const plusBinDir = path.join(tempHome, '.ccs', 'cliproxy', 'bin', 'plus');
+      fs.mkdirSync(plusBinDir, { recursive: true });
+      fs.writeFileSync(
+        path.join(plusBinDir, platformDetector.getExecutableName('plus')),
+        'fake-binary'
+      );
+      fs.writeFileSync(path.join(plusBinDir, '.version'), '6.6.80-0');
+      savePinnedVersion('6.6.80-0', 'plus');
+
+      const status = binaryService.getBinaryStatus();
+
+      expect(status.installed).toBe(true);
+      expect(status.pinnedVersion).toBe('6.6.80-0');
+      expect(status.binaryPath).toContain('/original/');
+    } finally {
+      plusConfig.repo = originalRepo;
+    }
+  });
+
   it('attempts to stop the proxy even when there is no tracked running session', async () => {
     const calls = {
       stopProxy: 0,