I downloaded the latest BIOS from IBM/Lenova for my 600E 2645 - 55U (version 47 I believe). I extracted it to a diskette Had a charged battery and power off booted. I get a blue screen indicating installer version 000 then after a few more seconds I get a dialog box in bottom right saying this computer cannot be upgraded the computer is locked press control alt delete to restart.
If I remove the diskette the Unit reboots (after 3 fingered salute) and starts the normal OS start up..




