Normally it would be sudo mount /dev/sda1 /mnt/boot/efi
Allright. Now it is /mnt/boot/efi
and I tried this again
[root@EndeavourOS /]# grub-mkconfig -o /boot/grub/grub.cfg
Generating grub configuration file ...
Found theme: /boot/grub/themes/EndeavourOS/theme.txt
Found linux image: /boot/vmlinuz-linux
Found initrd image: /boot/intel-ucode.img /boot/initramfs-linux.img
Found fallback initrd image(s) in /boot: intel-ucode.img initramfs-linux-fallback.img
Warning: os-prober will be executed to detect other bootable partitions.
Its output will be used to detect bootable binaries on them and create new boot entries.
grub-probe: error: cannot find a GRUB drive for /dev/sdb1. Check your device.map.
Adding boot menu entry for UEFI Firmware Settings ...
done
Many of the prior steps are not valid anymore since we writing to the wrong place so I would reinstall the kernel: pacman -S linux linux-headers then try rebooting.
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I’ll try that 
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You know what - it worked!!! I’m in. Wow that was fantastic, you guys are amazing. but I guess we still don’t know what caused the problem.
But many many thanks to everybody
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