If the motherboard is an older one the only way you can recover the motherboard is to get the BIOS ROM reflashed using a ROM Burner/Programmer which some Computer Stores may have (you may need to call around) or you can buy your own.
In newer systems the flash ROM is soldered to the motherboard and cannot be replaced.
Hi, If it's a BIOS update and if you interrupt it chances are it may cause a damage or may brick the laptop causing it not to boot up but in times like that the laptop being frozen your last option would be to do a hard reboot.
Do try opening Task Manager first and see if you can cancel the update.
Either you didn’t listen to this warning, something interrupted the update or you used the wrong BIOS update leaving you with a corrupted BIOS.