If your MediaPad T5 is on EMUI 9.1 or higher, PotatoNV may fail. You must downgrade first.
This is the most common DIY method for the , but it requires disassembling the tablet. Requirements: huawei mediapad t5 unlock bootloader
Requires disassembling the tablet to access "test points" on the motherboard. If your MediaPad T5 is on EMUI 9