My efi partition was overwritten by mistake and now I can't boot into KaOS. I was dual booting KaOS with Arch and both their bootloaders were deleted by mistake. I have managed to reinstall arch's grub but now I don't know how to install KaOS systemd-boot. Anyone to assist?
Not clear what you need, once you have the grub bootloader on one distro, you can add any other to it.
demm It seems it has formated his efi partition and he can't boot into Arch nor KaOS. In my advice the solution is to chroot to reisntall systemd-boot in KaOs https://kaosx.us/docs/chrooting/