: Enable USB Debugging and dial *#0808# to select ADB + MTP .
: Use the Odin Tool to flash the U4 binary firmware. Initial boot can take 5–10 minutes. A326B U4 Repair IMEI Solution Firmware
To utilize this firmware effectively, follow these common industry steps: : Enable USB Debugging and dial *#0808# to select ADB + MTP
: Fixing a persistent "Unknown Baseband" may require disassembling the device to access Test Points on the back of the motherboard to force the device into a specific repair mode. A326B U4 Repair IMEI Solution Firmware