@MrT10001 Getting stock Android 11 onto the Lenovo Tab was a real challenge yesterday.
Problems:
SPflashtool failed due to chip permissions.
Attempts using MTK bypass tools also failed
How it filaly worked (after ~3 houres)
Download Lenovo Software Fix Tool (thanks for the tip)
Create a Lenovo account (using a disposable email address)
Start the recovery workaround (but you can only flash up to Android 10 !!!!)
OK, perform a recovery with Android 10
The recovery tool downloads the ROM (A 11) to your PC
Before starting the recovery, you must replace the downloaded Android 10 files with the Android 11 files witch you downloaded from the UBports link bevor.
Then start the recovery process and the Lenovo Software Fix Tool will flash the tablet with Android 11, which you’ve placed in its nest, just like a cuckoo’s egg.
Translated with DeepL.com (free version)