Click on the "Choose" button next to the Authentication File path in the tool. Select the auth_sv5.auth (or similar) file you downloaded.
Power off the phone. Hold the Volume Down or Volume Up button (depending on the specific sub-model) and plug in the USB cable. tecno bb2 auth file new
If the phone doesn't turn on, the Auth file helps the PC communicate with the chipset. Click on the "Choose" button next to the
Specifically named for the BB2 / Pop 2 chipset (usually MT6580). Hold the Volume Down or Volume Up button
Modern MTK (MediaTek) devices like the Tecno BB2 use a secure boot system. This system prevents unauthorized software from modifying the internal partitions. An "Auth File" (Authentication File) acts as a digital handshake between the phone and the flashing software, allowing the tool to write data to the device's EMMC or UFS storage. Why You Need the New Auth File