"No bootable device found" Debian 12 on Toshiba

iHello, I am new to Linux and this forum. I recently installed Debian 12 on my laptop using a USB drive. The installation ran seamlessly, but when booting, I encountered the ino bootable device foundi error. I started looking for solutions and found some suggestions that did not work, as well as one that worked temporarily. Below are the commands that got the OS running, but unfortunately, they donit permanently fix the problem. I have to run from the USB grub command line every time I reboot in order to start Debian. Your help is much appreciated.

set prefix=(hd0,gpt2)/boot/grub
set root=(hd0,gpt2)
insmod normal
normal

insmod linux
linux /vmlinuz root=/dev/sda2
initrd /initrd.img
boot