Quick answer: This handset ships with Funtouch OS 13, built on AOSP 13; install official OTA updates via Settings → System update to move to newer AOSP-based releases when available.

To confirm exact build, open Settings → About phone → Software information and check fields labeled Build number, Firmware version, and Base OS. For command-line verification use adb: adb shell getprop ro.build.version.release, adb shell getprop ro.build.version.sdk, adb shell getprop ro.build.version.security_patch.

Update guidance: Back up user data via cloud or local backup before applying OTA. Keep auto-update enabled inside Settings → System updates, monitor patch level via security patch field, and install monthly or quarterly security bundles as provided by manufacturer. Carriers may delay OTA rollout; if updates absent after 4 weeks contact carrier or manufacturer support portal.

Advanced options: If official support ends, consider custom firmware such as LineageOS or Pixel Experience built on AOSP 14+; ensure bootloader unlocking policy for this device model, install custom recovery (TWRP) compatible with current bootloader, and verify vendor blobs for modem and fingerprint sensors before switching. Warning: flashing unsigned images voids warranty and may brick device.

Quick checklist: 1) Verify Software information for Funtouch build and AOSP base. 2) Confirm security patch date. 3) Back up data. 4) Apply OTA from Settings or official support tool. 5) If carrier blocks update, use manufacturer's recovery image via PC tool.

Launch Android build shipped with Vivo Y35

Install official OTA immediately to upgrade out-of-box OS 13 build (Funtouch OS 13) to latest security and stability patches.

How to verify shipped build:

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• Open Settings → About phone → Software information; note OS number and build ID.
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• Check Security patch level for initial release date and compare with vendor support notes.
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• Record Kernel version, Baseband version, IMEI and serial before any modification.
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Update and flashing recommendations:

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• Backup user data to cloud or local storage prior to any update or manual flash.
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• Charge battery above 50% or keep charger connected during update process.
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• Use only official updater or support-site firmware packages; verify file checksum before flashing.
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• Confirm region SKU matches firmware file to avoid network or VoLTE issues.
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• If recovery required, use stock recovery first; choose cache wipe before full factory reset.
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• For bootloop or flashing failures, collect logs via ADB (adb logcat) and contact official support with build ID and log dump.
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Verification after update:

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• Re-check Software information to confirm new build ID and Security patch level.
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• Run a quick modem and Wi‑Fi test, plus camera and sensors check to ensure hardware drivers loaded correctly.
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• Restore user data only after confirming system stability for at least 24 hours.
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Official Android version at market launch

Shipped with Funtouch OS 12 built on Google mobile platform 12; confirm build through Settings > About phone > Software information.

Factory firmware arrived with base release 12 and a factory security patch dated in late 2022 for most global SKUs; carrier-branded units may show different patch months or minor firmware customizations.

Before applying updates: back up user data, connect to stable Wi‑Fi, charge battery above 50%, then go to Settings > System updates > Check for updates and install official OTA only. If an OTA fails, reboot handset and retry update; use recovery mode to clear cache when necessary.

To stay current, check Software information regularly for patch level and build number, follow regional support pages for rollout schedules, and route major repairs or firmware recovery through authorized service centers rather than third-party images.