Offbus

https://en.m.wikipedia.org/wiki/Dead_reckoning

You can perform the bios update via bootable media. Here are the readme and iso links.

https://download.lenovo.com/pccbbs/mobiles/gruj37uc.txt

https://download.lenovo.com/pccbbs/mobiles/gruj37us.iso

I can’t help you with the recovery media, but a couple of the problems you describe were resolved with driver and firmware updates that are still available from the oem.

https://pcsupport.lenovo.com/us/en/products/laptops-and-netbooks/thinkpad-x-series-laptops/thinkpad-x1-carbon-type-20a7-20a8/downloads