I was struggling with this today. It turned out I was unnecessarily attaching a 1.8V adapter to the CH341 black adapter. I've seen many videos where people demonstrate that the CH341 black is applying 5V to the data track. When this happens, it's said that the BIOS can't be read. I was struggling because the backup was being created, but each time it was different. I looked for the problem elsewhere. I fiddled with the clip, etc. I lost patience and desoldered the BIOS from the motherboard. The problem with the backup persisted. After many attempts, I simply disconnected the adapter. I did this...