Use a reliable MicroSD card formatted to FAT32 .
If the physical buttons or SD card method fail, try official software recovery tools. Install Huawei HiSuite on your PC. huawei s7721u recovery image verify failed repack
Connect the tablet in (Hold Volume Down + Power while connecting via USB). Use a reliable MicroSD card formatted to FAT32
Troubleshooting "Recovery Image Verify Failed" on Huawei S7-721u (MediaPad 7 Youth) huawei s7721u recovery image verify failed repack
The tablet should enter "Automatic Update" mode and begin verifying the authorized image. 2. Alternative: Huawei eRecovery & HiSuite