Lenovo W540 BIOS repair and password [HELP]

Hi at all,

i got a W540 with a broken BIOS, after pressing the button, one beep and nothing further happend!
I tried to repair the BIOS according to this video : https://youtu.be/IqHAFk_Oy9Q
After flashing the both files into the Eproms, the W540 startet again, but the following messages appeared on the screen:
0271: Real Time Clock Error - check Date and Time settings
0183: Bad CRC of Security Settings in EFI variable

The first message I think would be not the problem, but the second !?!

The next problem: I can not access to the BIOS because of an unknown password !

Can anyone help me with this problem  - the unrepaird bios filse are here:
https://mega.nz/file/Z95EEBJQ#Js4upJL4en...sFYsbhv1Qk
and
https://mega.nz/file/R1wEHRaT#sA_LQ6m75Z...usUdPGU8a0

thanks a lot
greets
Sam