W995 issues no network coverage etc

Hoping you guys can help. New to the forum.

I bought a "spares/repair" w995 on the internet. He said it was faulty because when he turned it on it said "insert correct Usim" whatever, it was network locked to 3.

I got it, and unlocked it using a £3.50 unlock service on ebay. Worked perfectly, was able to send texts etc on a T mobile sim. Only faulty thing was I had no sound, from the speaker or headphone jack or when making a call, sometimes there would be a headphone icon at the top. When I take a picture on the camera, it DOES make a sound. I assumed this was acoustic drivers, however flashing new ones made no difference.

Anyway, I then went on to debrand it using a2uploader. Flashed the firmware and file system and it went ok, then did the custom pack and seemingly no issues. Turned it on and it had a customization error, so I flashed a different custom pack and it turned on, and gave me the "no network coverage" error. This is where I'm stuck.

I can't repair the phone using PC suite. SEUS tells me it's up to date and gives me no option to repair or reinstall. Using the file manager on a2uploader, I get errors when I try to read or rename a file.

I've googled this for about 2 days straight and tried various things but nothing has worked. I ideally need to completely wipe the phone and reflash EVERYTHING, however the only way I can see to do this requires the SEtool and I haven't got much money. Got any ideas?