[volavka]

I have a doubt, I have been writing an MCU again and with an error, just in the first line of the file, instead of 'FE' is 'FF', is this normal? What should I do?

In the image I put the error that happens in xprog at the time of write, and in the software 'compare files', on the left is the file that you provided me, on the right is the file after write and read again on xprog

that's happened because xprog fw not good
after appear message verify error , just click no ..and re write again , may need several time to try then should work

Good luck