How do i rebuild the nixos bootloader from windows?

[eljamm]

This also came up recently:

Changed motherboard, how to fix bootloader now?

Boot into the ISO, mount your partitions and chroot into your system using nixos-enter. Then run NIXOS_INSTALL_BOOTLOADER=1 /run/current-system/bin/switch-to-configuration boot That should reinstall the bootloader.

I guess this way you don’t need to re-install anything else.