Install Same Region Firmware
This page uses one example: installing the original China firmware on a China Yoga Pad Pro AI.
You can do this even if a different-region firmware is currently installed.
You can start once the device is connected in USB debugging mode or Bootloader mode. See Connecting a Device for help.
In the sidebar, click Flash Firmware and follow the wizard.
Choose your device's original hardware region, no matter which firmware is currently installed. In this example it is PRC.
Compare the device's original region with the firmware region. In this example, the regions are the same, so choose Install same region firmware.
Choose whether to keep or erase user data. When the installed firmware region and the target firmware region are different, you must choose Wipe Data. Even for the same region, you should usually Wipe Data when downgrading, or the device may fail to boot.
If you chose Wipe Data, LTBox asks for a country code. Because you are installing or restoring firmware for the same region, choose CN.
Select the folder that contains the firmware images. In this example it is the TB520_ZUXOS_1.5.10.186_Tool\image folder.
Check the options you selected, then click Start. The task begins and the device reboots several times as needed.
The Flash firmware partitions step takes the longest. You can click Show log to see more detailed progress.
When it finishes, the Yoga Pad Pro AI boots with its original China firmware installed.