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Try turning off cell data.

Yes

60 is only possible with 2 channels. Once you plug the 3rd channel in, you loose the 60fps option.

After the update, be sure to manually default the cameras settings, then press and hold the hard reset button on the side of the camera for about 5 seconds.

Sounds like it's connected properly if it enters and exits parking mode correctly. All parking modes will consume power. The draw between the different modes is minimal. Newer cars computers systems will alert you of a power draw, so I don't think there is much you can do here, unless you...

Then it's still under warranty. You should have had it replaced instead of taking it apart.

Looks like possible poor power. How are you powering it? Are you using the included 12V car adapter and Viofo power cable?

https://www.viofo.com/en/accessories/213-780-viofo-rear-cable-for-a139-2ch3ch-dash-camera.html#/120-cable_length-rightangle_6m

The cameras settings default automatically when changing firmware, but manually defaulting the settings in the menu should be done as well. Did you do this? If not, you should. This will ensure there is no leftover values from the previous firmware messing with the new firmware.

Be sure to manually default the cameras settings in the menu (it's an option in the menu) after any firmware change. You should then also press and hold the hard reset button on the side of the camera for about 5 seconds.

What was the measured voltage at the fuse for the red wire when the red LED inside the HK3 was not lit? What did you have the kit set to?

Sounds like a poor cable connection or bad cable. Make sure they are fully seated. It should take some effort/force to get them to seat properly. When properly seated, they should not be very easy to remove. Also, the SanDisk Ultra cards are not a good choice in dash cameras. Get the SanDisk...

They take some force to get them to snap in firmly. Once in correctly, they should not be easy to remove.

https://www.viofo.com/community/index.php?threads/queries-small-battery-inside-dashcamera.28378/

That is the rtc battery. It holds the time and date.

Did you remove the protective plastic over the lens? Why did you not figure this out 3 years ago when you bought it and get it replaced if needed?

On V1.5 you have the 5ghz option in the camera menu (not in the app menu)?

You must have very early firmware. 5ghz was removed in later firmware version.

The Plus does not have 5ghz. At least not in the latest firmware versions.

Your issue is the (5) in the file name (you must have downloaded it 5 times). The name must be FWA129.bin.