That should be it - reboot and enjoy your modded BIOS. Boot into Windows again, open a DOS window and navigate to USB/TP/bios_mod.įrom the winflash GUI, select "Flash BIOS only" then click on the "Flash" button. Type in: PFLASH /sa B146.FL1 (This should downgrade your T420 to BIOS 1.46)ĥ. ![]() You will need at least PFLASH.exe, B146.FL1, B146M.FL1 and the TP directory with the winflash.exe.Ĥ. I think I used HPUSBDisk.exe and the files from usbdos.zip while running some Windows OS. Grab a USB stick and format it FAT32 with the hidden DOS system files on it. Looks like I did not want to delete anything I had found, though it is not needed to get the downgrade done.ġ. ![]() ![]() So yeah, the procedure seems to be still doable.
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