Thank you @henryk ! You have worded some parts better than I did, I’ll probably update my guide here and there but from what I see I can confirm that everything looks correct.
I would maybe add that you should ensure somehow that the thin wires do not move / touch during using the programmer. At least for me they were still easily moved, that’s why I opted for hot glue.
@MuckyDerMuck I see that you already created a new topic regarding your backup.bin and are already receiving help there.