Have you tried any of the hard factory reset procedures on the affected cameras that I recommended? The HB itself shouldn’t be capable of permanently bricking a camera. Eufy cameras have a pretty robust recovery/reset mechanism, so a failed firmware update or migration shouldn’t leave the camera permanently unrecoverable.
The firmware isn’t committed to nonvolatile storage until the update has fully completed and the new firmware has been verified. If something goes wrong during that process, whether it’s software corruption, an interrupted update, or something similar, the camera can potentially end up soft-bricked. A hard factory reset should clear the affected state and allow the camera to fall back to the last known-good firmware, essentially putting it back into the state it was in before the failed update.
I’ve actually seen this happen firsthand. I had a C120 doing a firmware update when my cat decided the power cable was a ribbon toy and unplugged it right in the middle of the update. I was absolutely convinced I’d just killed the camera. Did a hard reset, and it came right back up. I was then able to run the firmware update again without any issue.
One other thing I’d check: make absolutely certain you’re using the correct power brick with each camera. I have family with these cameras and they confuse the bricks all the time, especially after moving cameras around.
The C120 uses 5V/1A, while the E220 uses 5V/2A. The C120 will work with the 5V/2A brick, but the E220 needs the 5V/2A supply. Using an inadequate brick can cause the E220 to power on but behave very badly or have all sorts of strange issues.
At this point, I’d work through these in order:
1. Hard factory reset the affected cameras
Don’t just remove and re-add them in the app. Use the actual hard reset procedure.
C120/E220:
Remove the camera from the app if it’s still there. Give it about 3 minutes to soft reset. Then hold the Sync button for 10 seconds, until you hear TWO beeps. You’ll hear one beep during the initial soft reset/Bluetooth activation, so ignore that and keep holding the button until you get the two beep tone.
S340:
Remove it from the app if it’s still there. Give it about 3 minutes to soft reset. Then press and hold the Sync button for 15 seconds. No less, no more. It will beep as well. The S340 sync button is notoriously finicky, you must keep it pressed down the whole time and it’s pretty stiff.
2. Completely power down the HB
Don’t just reboot it from the app.
For the HB Pro, if you want to give it another shot, hold the Sync button for 10 seconds to shut it down, remove power, wait a minute or two, then power it back up. I think plugging it back in powers it on again, but I honestly don’t remember off the top of my head.
For the HB3, just unplug the power for about 30 seconds, then plug it back in.
3. Power cycle the router
Even if everything else on the network is working, this can clear stale DHCP/ARP entries or other phantom device states that may be affecting the cameras.
4. Try the cameras again
Once everything is back online, give the HB and router a few minutes to fully initialize before attempting to add anything.
People will understandably say, “But everything else on my network is working,” and that’s true, but that doesn’t necessarily rule out a network-side issue affecting the cameras specifically.
I’m sure they’ll refund the HB Pro if that’s what you’re requesting, but I wouldn’t necessarily expect them to do much with the cameras beyond potentially offering a discount or some other goodwill option. That said, they could surprise you, hopefully.
Ultimately, I genuinely hope this turns out to be something recoverable and that none of these cameras are actually hard-bricked.