The specification refers to security patch levels or build dates from that year (e.g., March, July, or December 2021). These versions often include:
If you are attempting to manually install 2021 firmware on a vivo Y12i today: vivo y12i firmware 2021
| Feature | Details | |---------|---------| | Kernel | Linux 4.9.x | | System partition | Read-only (EROFS for system, F2FS for user data) | | Firmware format | OTA zip (recovery flashable) or .pac (SP Flash Tool) | | Rollback protection | Enabled (cannot downgrade to Android 9 easily) | | Bootloader | Locked (unofficial unlock requires paid tools) | | Recovery | Stock Vivo recovery (no ADB sideload by default) | The specification refers to security patch levels or