Fixed it following this:https://neosmart.net/wiki/fix-uefi-boot/#Fix_UEFI_Boot_in_Windows_8_81_or_10
Then I picked the newly appeared boot partition in the boot priority tab in bios and Windows booted fine after that.
As in the title, Windows prompted me if I want to delete the old Windows install after an update, I clicked delete and went on with my day, only to get on today and see that my PC can't detect a boot partition, plugged the SSD into another pc, the Windows folder is there (19.4GB). I wanted to ask, is there any way to recover that install without having to do a clean install? Diskpart shows 5 volumes, 2,3,4 are hidden, system and boot.