Advice on fixing corrupted filesystem

[Windows 11]

hi guys, my zbook laptop, which i bought refurbished a few years ago, came with Win11 and something like around 7TBW on the clock. Nothing much, but fairly used. Crystal Disk showed around 80%. Worked perfectly, until this day, i had woken it up from sleep, only for it to freeze, throw a BSOD, restart, but instead of booting, showed a message saying that its missing a device or smth. Tried retrying, it said its missing winload.efi. The disk wasnt accessible even from Debian. Loaded up a bootable, repaired it, it somehow made the installation bootable, but the drive letters are all mixed up and

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