The Vivo Y12i must be in EDL mode for the computer to recognize it as a flashable interface. Power off the device completely.
Check your PC's "Device Manager." Under Ports, you should see "Qualcomm HS-USB QDLoader 9008." Step 4: Flashing the Firmware Repack
Install the AFTool or the QPST Flash Tool, depending on which version your firmware package recommends. Step 3: Enter EDL Mode (Emergency Download Mode)
The Vivo Y12i must be in EDL mode for the computer to recognize it as a flashable interface. Power off the device completely.
Check your PC's "Device Manager." Under Ports, you should see "Qualcomm HS-USB QDLoader 9008." Step 4: Flashing the Firmware Repack
Install the AFTool or the QPST Flash Tool, depending on which version your firmware package recommends. Step 3: Enter EDL Mode (Emergency Download Mode)