Here's how I rolled back from a 440 firmware to a 405 with the bootloader initially locked.

1. Boot into the system.
2. Enable for developers, USB debugging and OEM unlock, both items must be enabled, it is important!!
3. Connect to the computer with
a cable 4. From the command line: adb devices
adb reboot bootloader
5. Making a file with your serial Lenovo Xiaoxin Pad Pro 12.7 (2023) - Discussion (Post changing #125800481)
6. Command fastboot flash unlock sn.img
7. The tablet will swear at the unlocked bootloader and reboot a couple of times.
8. Sew 405 according to the instructions Lenovo Xiaoxin Pad Pro 12.7 (2023) - Discussion (Post changing #125985716)
9. Lenovo Xiaoxin Pad Pro 12.7 (2023) - Discussion (Post grihya #124761580)
10. Disabling Lenovo Xiaoxin Pad Pro 12.7 (2023) Updates - Discussion (Post Afad #125692727)
11. Install Google services Lenovo Xiaoxin Pad Pro 12.7 (2023) - Discussion (Post grihya #124761909)


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Lenovo Xiaoxin Pad Pro 12.7 (2023) - Talk - 4PDA