Update BIOS on Lenovo Laptops without battery

https://superuser.com/questions/1569417/how-to-update-lenovo-bios-on-a-t460-without-battery

After a month searching the internet, I finally got my Yoga X1 Gen2 bios updated without battery. It was much more simple than I thought.

• download the official bios on lenovo support page and extract it.
• Run WINUPTP64.EXE or WINUPTP.EXE using command line with “-sp” option.

In my case, in CMD, I typed: C:\DRIVERS\FLASH\n1nuj30w\20210302.08305818/WINUPTP64.EXE -sp

Command line options:

   "  -s        ... Silent mode\n"
   "  -r        ... Reboot after program completed\n"
   "  -sp       ... Skip power status check\n"
   "  -chk      ... Check current TPM firmware\n"
   "  -suc password ... Skip user confirmation at startup\n\n"
   " Note: -suc option requires supervisor password.\n"