09-23-2017 05:10 AM - edited 09-23-2017 06:02 AM
I've set the supervisor password some time ago on my T450s. I think I used the special character "!" which was accepted at that time, but I'm not sure anymore today. Now after severeal BIOS updates the "!" only leads to a beep of the system and I also tried all of my standard-passwords without "!" , but without success.
Now I've tried to roll back to older BIOS versions to try if one of these accepts the "!". But every version I tried leads to a "secure flash authentication failed"-error after the reboot of the laptop to actually flash the BIOS. The following link says its the Rollback Prevention Enabled, but I checked in BIOS and it's clearly disabled.
Now I have no idea how to proceed.
Has anyone seen that the BIOS has accepted special characters like "!"?
Are there other T450s which are not able to rollback to older BIOS versions with the above mentioned error?
- Model: ThinkPad T450s 20BW-S03E00 (the one with Intel graphics only and a core i5-5200)
- BIOS: 1.29(JBET65WW)
Thanks in advance!
09-23-2017 09:06 AM
As far as I know,, no BIOS password has ever allowed a "!"