How to flash a modified AMI Aptio V UEFI BIOS?

Question

MSI

Recently I decided to reflash the motherboard on my msi laptop through the amibcp 5 program in order to open hidden parameters.
I first took an image of the current bios through afuwin, edited it, but when I started saving I got the error "Saving secure rom as unsigned", and when I tried to flash it through the same afudos writes "error 7 - checksum error". I visited to sew with the help of universal flashers, but writes that the memory is write-protected. I decided to check and flash my own bios (take a dump and write it down) and afu again gives an error 7. What am I doing wrong, and how should I?