Lenovo Tablet 10 20L3 BIOS problem

[jlopz]

Hello, I have a Tablet 10 Lenovo L20L3 S00300. After oficial BIOS update from lenovo web site the tablet become blocked. Not possible to enter setup or Windows.

I tried different approachs but in the end I use this BIOS (https://www.bios-mods.com/forum/Thread-L...light=20L3 ) and I Have programmed the tablet using a HW programmer CH341A.

Now the tablet can boot windows (but with several problems, I can not enter in a user account for example, only the task manager is ok and I can execute command line commands. But the oficial lenovo flash SW does not work), but I lost all the board data (UUIC, Serial number, MAC address, etc) and the tablet run slow and some peripherals are missing.

I have the original box so I have the above mentioned data.

How can I rebuild this information? (UUIC, Serial, MAC, hw configuration....).
I do not have a backup of the original working BIOS (but I have a backup of the BIOS that does not work).

Many thanks!