Since Huawei removed free unlock codes, the only reliable method for MediaPad T3 is using like DC-Unlocker , HCU Client , or PotatoNV (for older Kirin chipsets).
Since HUAWEI no longer provides codes, try: How to Unlock Bootloader in HUAWEI MediaPad T3 ...
: Advanced users on platforms like the postmarketOS Wiki suggest using hardware exploits. This involves shorting "test points" on the motherboard to force the device into EDL mode and flashing an "engineering bootloader". This is high-risk and can permanently "brick" the device if done incorrectly. Critical Steps Before You Start Regardless of the method, you must prepare the tablet: Since Huawei removed free unlock codes, the only
PotatoNV exploits a vulnerability in older Huawei Kirin chips. Works on most MediaPad T3 models (BG2, KOB, AGS series). Since Huawei removed free unlock codes