When power on vivo y12s ( vivo 2026) alert message:
Reminder:
MD authentication failed. Please download signed MD Image (..verified..Img)
For fix problem, please follow step by step
1-Need your device unlock Bootloader via any tool but for now i unlock bootloader with Unlock Tool
When done unlock bootloader, Please go to Vivo Support System Update vivi Y12s or any model allow your device. By download Zip rom file.
And then just Copy Zip rom file to SD card
After Copy Zip rom file to SD card please put it to your device
Continue step try make your phone into Recovery mode
When your phone stay in Recovery mode choose install file Zip from SD click install and just wait until it complete, When done pone will reboot it's mean that Successful fix your problem,
Please follow full step
Tool Link Free DOWNLOAD
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