I sort of have a specific problem.
I am new to dual booting, this being my second time.
I accidentally installed and upgrade to my manjaro kernel which had
rt at the end, which caused a lot of errors to me, one of the first making the efivarfs filesystem unmountable, and this is - I believe - another problem from that.
Some days after rebooting my laptop, it couldn't identify any bootable device nor partition, which was a very weird problem that I fixed by using chroot on my manjaro bootable usb, and installing grub.
I straight after that updated my kernel to a non-rt version which stopped the first problem, but isn't fixing the second: I am unable to boot into Windows from grub.
Both are UEFI. (Well, I think so. I don't think I checked Windows, but I did check Manjaro), one of the ways I tried to solve this being going into the grub commandline and trying to boot into windows using the
bootmgfw.efi file in
/Windows/Boot/EFI/. Which results with a screen in windows saying something about windows failing to start because of a recent hardware change.
It tells me to reinstall it, but I do not wish to lose the data and I do not have my live installation media for windows,thus it is not an option.
So, I try to use the
bootmgr.efi file because it is the boot manager, but grub says it cannot load the image, even after trying grub-update.
(If you couldn't tell, most of the things I did were off reading other answers and questions online).