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Solved :USB Boot not showing in Thinkpad e14
(programming.dev)
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I have completed the windows setup with the usual 3 partition and I used Ubuntu as well but booting is not the problem, the bios just doesn't seem to pick up the pendrive
Okay. What does your Config > USB look like?
Power through usb and the same on battery
Have you tried completely resetting all BIOS settings?
Factory defaults tried that
The last thing I would try is seeing if you can update/revert the firmware on this thing.
If not, then I think I might be out of ideas unless you happen to have a KVM switch that can stream over le intwerbz.
How do you reset the firmware ?
That's something you'll have to Google, but there should be a tool in Windows (you might have to install it from OEM website if you've reinstalled to debloat).
Tried that as well but that as well uses usb boot so that is also net detecting
What about this process: https://pcsupport.lenovo.com/us/en/products/laptops-and-netbooks/thinkpad-t-series-laptops/thinkpad-t14-type-20s0-20s1/20s0/solutions/ht500008-how-to-update-system-bios-windows#Update
See "Updating the BIOS from Windows". It's not your exact model, but the process should be the se.