the solution for the endeavour.db problem you can find here
in solving your main problem with booting, someone who knows what to do will surely be able to help you soon.
You can try to use an usb chroot intoo th me system. Mount root intoo /mnt and boot druve intoo /mnt/boot then arch-chroot in inte /mnt try to install linux-lts and linux-lts-headers whatever if tou have nvidia… sudo mkinitcpio -P and check if lts kernel also works
I saw a failure after installing it a second time. I’ll try to install Ubuntu and see if the problem persists, who knows. I’m planning on upgrading that computer in a few months, but it would be quite annoying to have an hardware problem now.
I have the same issue. Was running fine on a Lenovo Ideapad 3 Chromebook until an update 1.5 days ago. Complete reinstall did not do it. I will try a reinstall with LTS kernel and see what happens.
Just a piece of advice. Always have the lts kernel installed in addition to the latest kernel on your system. This gives you a fallback option if there is an issue with booting.
Is basicly simple you have to mount your root to /mnt and boot partition /mnt/boot/efi then sudo arch-chroot /mnt but dont blkid someting to see your drive… install linux-lts and uts headers helps…and add to grub