: Before reflashing, try a Hard Reset (Power + Volume Up) to enter recovery mode and wipe the cache partition.
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But it is for:
The uses Qualcomm Snapdragon 439 -based firmware. For a 2021-era update or repair, the firmware typically includes Funtouch OS 9.1 (based on Android 9) or higher. Firmware Basics & Downloads vivo y12i firmware 2021