Firmware Modding and Problem

Hello all,
I am a laptop repair technician who repairs a laptop at the chip level doing very well. But now I have some problem with laptop bios edit (Firmware Modding) before intel 4th generation CPU it’s easy modding bios just download update bios from laptop manufacturer website do some editing with hex editor its just work. But nowadays latest generation CPU if do the same thing before I do the old one I can’t get a display because of their CPU microcode problem and FITC table problem and don’t know how to fix that problem, please any help me how to fix it.