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Looks like you have the Nelly's version: https://support.nellyssecurity.com/hc/en-us/articles/360038885453-How-to-Upgrade-Your-NSC-DB2-Video-Doorbell-s-Firmware

As to not brick beyond our current knowledge I highly suggest he puts the rca firmware on his rca vdb then watch serial as he does a partial reset as well as a full reset to see what both erase if anything.

Wow now your making me interested even more. Looks like this dav file could actually be some compressed file like a tar maybe. This is good stuff.

Seriously I think if someone has a dead vdb I would suggest taking a blank se card and putting 2 copies of firmware on it ezviz and digital that sdcatd will most likely recover 90% of dead vdb

Digitap is the unbranded uboot update file but the unattended recovery tools will want to make sure it’s branded

This camera could be a ezviz camera which means it has a ezviz bootblock it’s looking for ezviz.dav firmware file to recover the bad firmware would be nice to know if other brands are looking for ezviz or a different file. They all might in fact look for the same file.

Tap a button on your coomputee after the camera boots and see if you get a Linux prompt or a password prompt

I highly doubt the code is missing. It most likely is just options set in the nvram or config file

Yes changing a 1 to 0 or 0 to 1 but not the firmware. I seriously think it’s this config file he’s talking about

Dont think so, it might be simpler. I won’t be home for a while so can’t jump into it like he did but great stuff has been found.

Apparently you missed the fact that it’s running Linux or something of the sort hence why it has uboot. If this is the case then it’s simpler then modifying firmware and is as simple as logging into the device and turning options on by hand.

im saying this one last time. No one started something again. You are the one continuing this and attacking everyone. You are the one off topic. You are the one attacking me privately now. You have stated your piece. Everyone knows your postion Drop the subject and end this NOW! this is not the...

FYI... The forum is full of troubleshooting and right and wrong info that people conclude with the right info after testing and helping each other The 101 is the RIGHT info after testing and finding the answers either in pdfs, sites, or our own tests. We can't weed out the whole forum of all...

you are out of line! drop the subject!

but I suggest staying away from the highside just to help with the voltage spike of a button push

good to know, thanks for the correction

What comes across serial NOW that it works from power up THRU a ring of the bell and connecting to it via app!.... Once uboot is done and it boots into firmware does serial go quite.

This is out of line and out of control! 1. the power kit is required for mechanical chimes. 2. these doorbells are not designed for lower then 12 volts you should be running 12v, it's designed for a normal doorbell transformer. not sure if 24v was ever considered spec for this doorbell. the...

look at your app CLOSELY! if the device is internet facing and you can see the VDB from app while not home then you should see 3 hours of video recorded to the cloud. look in settings related to cloud storage also. 2 options from what I remember: Free 3 hours or paid subscription.

Let me be clear, this device along with many other IOT devices are designed for an idiot to install. you MUST isolate if you don't want it to phone home. most IOT devices can poke a hole right thru a firewall. let me try to elaborate. you can NOT just block people on the internet from the...

yes your correct, the power spike is for the chime not the vdb. the box is mainly to hold and send constant clean power to the VDB to keep it powered up and help with the spike needed to set the chime off. And yes, they can go bad!

if you have the device internet facing then the video is stored on their servers even if you op out of cloud storage. they save 3 hours I think. no way to turn this off unless you put the device in a VLAN with NO access to internet

If you get good firmware running and can TTL into the device can you poke around and see what OS is running on it, is it linux, maybe busybox. is it password protected. what chipset is this. shame we can't tasmoto it lol!

FYI if this device is on a network that itself has access to internet then the doorbell phones home even if you don't configure it thru the app. If you want it not to then it needs to be in a VLAN that is NOT able to access the internet.

You would want to make sure his transformer is the right voltage and that the chime rings with a 9volt battery to rule out the chime being bad

If you log into every app and there is no camera in those apps and it still won't add to the app you want then you might have changed the onboard SSID or password which won't let it sync to an app. there is info about this in the 101.

you might be stuck with the original app. I know hig/ezviz made there apps lock to a camera so you couldn't switch apps back and forth. Also you might need to factory reset the doorbell but if your on a different firmware there is a method to reset it without messing it up. Also, try tapping a...

make sure your using the little power thing inside your chime box

sounds like your ezviz chime relay inside is damaged.

Can you validate that the US or EU version of EZ-Viz firmware is 5.2.7 or higher, if so I'll upgrade just for the 256GB support.