Well, OTA update may be a bad idea. USB Key is good enough for anything and don’t rely to a server. For your radio problem, it would solve it.

That’s a multifile split for when we needed to upload them to places where a max upload limit was set. You need to select all and unzip them. Your un zipper should be able to find the pattern and unzip as one. I don’t think you will be able to do anything if you unzip one by one

If you mean by that “This person is right” I totally agree with you