Support regional Galaxy Store downloads and store metadata

[HotKids]

Galaxy Store apps whose stub interface is unavailable fall back to ODS with the same configured device, CSC, MCC, and MNC. CHC defaults to 460/00; other CSCs retain 425/01, the SM-S948B/DBT defaults, and existing nonempty network-code overrides. Regional endpoint discovery follows AppMarket’s Samsung protocol, with a restricted host list and fixed endpoint fallback. The observed Israel endpoint preserves the existing global profile.

Native products request a full APK without the installed-version field. Definite HTTP/API rejection permits restore authorization; China requests can then try the partner interface once, only with matching package, product, version, version code, full size, and a Samsung HTTPS URL. Malformed replies, mismatched grants, login-required apps, and ODS timeouts cannot enter that retry path. Successful stub replies receive the same identity and URL checks.

China products explicitly marked linkProductYn=1, with a known full-package size, use the partner interface directly. Its observed replies omit Samsung's GUID and product ID: either must match when present, while version, version code, and full size must always match the selected metadata. Only this branch additionally permits the exact HTTPS download host auto-dd.myapp.com; native, stub, restore, and nonlinked mirror grants retain the Samsung-only host restriction. No purchase or order requests are made.

Stub and ODS requests have 40-second deadlines. A stub timeout can use the same-profile ODS fallback. Rate-limit errors retain their retry timing and stop further fallback requests; a rate limit during optional discovery or details preserves the already authorized APK.

Store dates and original publisher notes are bound to the selected release using stable main/overview/main responses. APK filename timestamps are no longer treated as release dates. Optional details cannot invalidate an authorized APK.

Anonymous final-source probes resolved com.shuge.fitness 4.6.32 through the direct China partner route, matching its 93625737-byte metadata and returning the allowed Tencent HTTPS host. Samsung Assistant 9.4.02.7 still resolved through Samsung's stub with store date 2026-08-25. No APK content was transferred by these probes. Native Obtainium settings and installation UI remain unverified.