Flashed successfully, everything works. New wifi card is on its way, it will be checked later. Thank you so much!
I don't have Lenovo's wflash2 utility for pure DOS, maybe quid have it. It's APTIO V bios, you can try AFUDOS v5.07.01
Thank you again! Finally I have wireless AC on the laptop! Thanks for the tool for bios backup too. And I didn't know I can create dos bootable file with Rufus. Thank you and have a nice evening.