Update: I found out there might be an issue with Big Sur on some 2013-2014 models and that might be the reason for the update issue, but that's not my main issue. The only difference that I can see in Disk Utility is that the problematic MBP has "2 not mounted" compared to the other 2 and its the Preboot that is not mounted. I tried the built in keyboard as well as my magic keyboard. i tried with a live kali usb still not working. I also tried with bootable USB devices but the option/alt key doesn't work to select boot option. the only startup key combination that works is cmd+S. any combination of cmd R option/alt shift doesn't work. I have catalina installed and can't update to big sur ("update not found / the requested version of macOS is not available) so i wanted to do fresh install from recovery mode but after trying all possible options I can't get anywhere.
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