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Lol, you got me :) Tried edge & chrome, but old internet explorer ftw it seems. I just did a usb upgrade to the V3.4.98 firmware and all seemed to go fine, and using IE in the web GUI there's now a button to firmware upgrade, and I can browse for files also. I'll do some research before...

Great call! Thanks for the tip - did use that tftp program from github and got the oldest firmware I could find installed - 3.4.82 lol scottlamb/hikvision-tftpd Went nice and quick, no issues. Easy as. So have set up the NVR with a new password, and I now have access!! :D But it can't find any...

Thanks for the response. This looks interesting! Did some google and found a hikvision tftp in github, so will try that this week while I wait for some cables to be delivered. Should answer the question on file size at least. Cheers.

Appreciate the response. I've ordered a serial cable (no rear DB9 to connect to, so I assume one of the 4pin white plugs on the mainboard required?) I can see the GUI on the monitor, but the usernames to select from are all strange characters, with 4.0 in top left (was told database corrupted)...

Hi all, hoping someone may be able to help please. I recently received an NVR with corrupted database (likely installing incorrect firmware), and want to put fresh firmware on it and try to bring it back to life. It's a region RR , currently can boot up to GUI showing v4.0 of whatever firmware...