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According to the hikvision spec sheet, the camera has a fixed focal 4mm lens and no optical zoom - in essence making it a PT camera

I think its time to return this back to your supplier

Not sure how you're flashing the DVR is it via the web recovery UI or a tftp recovery tool? If the latter, try this

That's Hikvision for you, confusion is their middle name. On firmware, you can go directly to the latest firmware from whichever firmware the NVR is on. For best practise, I usually factory default the equipment after a big firmware jump and set up from scratch

Does appear to be the C model

Your DVR is the first gen acusense (K71) and the firmware I previously linked is the only one on the portal. Try V4.70.110_220328 which is found on the Hikvision website but nowhere to be found on the portal.

You used the gen 2 firmware when your recorder is gen 1 and you've likely bricked it unless it can be revived. Probably best to return back to your supplier explaining above. The correct firmware for gen 1 is here

There is a tamper screw on the bottom of the doorbell. Remove it and take off the front plate which will reveal a reset button on the left hand side. Try the 30, 30, 30 trick and keep reset pressed at all times; 1) Press reset and wait 30 secs 2) Turn off power to the doorbell with reset still...

I don't think the doorbell is being reset if it prompts you to unbind after powering back on. Try the 30, 30, 30 trick and keep reset pressed at all times; 1) Press reset and wait 30 secs 2) Turn off power to the doorbell with reset still pressed 3) Wait 30 secs 4) Turn power back on and keep...

Use the batch configuration tool to upgrade your DVR to the latest firmware 4.25.001 Once upgraded, factory default it and set it up from scratch

The DS-7216HUHI-K2/P supports power over coax. Depending on which model your friend has, either the built in PSU has failed or if the DVR is the non P model, he likely has an external box PSU which has failed.