A: Re-lock the bootloader if you ever unlocked it. Or reflash using “Format All + Download” (last resort – will erase IMEI).
| Model Number | Region | Chipset | Common Firmware Version | | --- | --- | --- | --- | | | India, Bangladesh | MediaTek Helio P22 (MT6765) | PD1909BF_EX_A_1.72.9 (2021) | | PD1909F_EX | Global (Russia, Indonesia) | MediaTek Helio P22 | PD1909F_EX_A_1.72.11 (2021) | vivo y12i firmware 2021 upd
Disclaimer: This article is for educational purposes. The author and platform are not responsible for bricked devices, lost IMEIs, or voided warranties. Proceed at your own risk. A: Re-lock the bootloader if you ever unlocked it
If you are uncomfortable with the technical steps, visit an authorized Vivo service center and request a “reflash to PD1909BF_EX_A_1.72.9 – 2021 build.” Leave a comment below (moderated). For direct downloads, check the XDA Developers Forum for the Vivo Y12i dedicated thread. The author and platform are not responsible for
A: Yes. The 2021 update includes all previous patches. No need to flash intermediate builds.