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I understand that however my goal is to make the best of what I have, I managed to clean up the chip a little and got the device working normally again so I don't see why I should just dump a perfectly working DVR & set of cameras if I can just 'jankily'-hack my way to what I want.

Your assumption was 100% on the mark, I unfortunately had to be a little more intrusive as wipes would not clean it (a precision artist knife) however I did manage to cleanly separate all the pins & to my glee it is working again. As to my second request though, I seem to still be caught at a...

That was my instinctive reaction too, I’d like to at least check if the UART pins do or don’t have a U-Boot output. Problem is though I don’t know how to do that, I need guidance on what pins and what voltage and settings to get a TTY output.

Yet again digging up a topic, apologies. How did you manage to find those alternate model names/codes. I've just thrown up a post asking for help with a few things (DVR4-1580/DVR4-720P/DVR-6904AU) and this is one part I need help with, see here.

I've hit both a dead-end information-wise and literally with my DVR now boot looping.. I have a Swann DVR4-1580/DVR4-720P/DVR-6904AU (last one is a guess from my 'detail' section before boot looping my dvr) and I'm in dire need of firmware and guidance from anyone to just get it working again...