You mentioned you had (In)Secure Boot disabled previously. I know on my MSI motherboard their BIOS “update” likes to mess around with your settings without your permission. It will enable (In)Secure Boot even though you have it shut off. It will change your default boot in UEFI to the MSWin boot, and mess up your Grub bootloader (I got around that by deleting the MSWin option in UEFI and letting Grub chainload it)
It’s possible Lenovo’s latest BIOS updates are doing the same thing. It’s something we’re going to have to start looking out for; not just with MSI but probably a lot of other board/BIOS makers as well (I think Microsoft is trying to push it on manufacturers now).
BIOS config often becomes incompatible when the firmware is updated.
It used to be issue that if you did not reset to defaults after an update all sorts of thing would break.
These days it seems that an update will force the reset to defaults in sine cases.
So, yes, the setup of BIOS config may well need to be redone.
Did you fix the issue? I’m having a similar issue with yoga 7i with ultra 7 155u. I’m trying to install fedora 41 workstation edition and it’s getting stuck after grub menu in a black screen with a non blinking hyphen in the top left corner.