390E & 390X (maybe more) BIOS flashing with a flat batte

[richtoy]

The simplest way to flash a Thinkpad that has a dead battery (this applies to 390E & 390X for sure) is to press and hold the NumLk/ScrLk key at each prompt where you are invited to press 1 by the BIOS update program. You can use the standard IBM disk for this. You can see this documented if you open the file Btflash.f04.

#Check_AC&BAT // [--] Check AC and highly charged battery. Press <ScolLock> to bypass

Happy flashing