How to factory reset Vision?

I too am having issues with data fields - I select certain metrics to be shown and the Varia shows something different (Cadence becomes Vertical Speed, %FTP becomes Power Balance). It's making the Varia Vision useless.
Mine has been updated and is running v3.40. And my Edge 820 is on v8.40 so both up to date.
Would like to reset Varia and see if it clears it.

Anyone know how to do this?

This is not easy to do as it only has one button

1.Press power key to turn on device
2.Countdown 5 seconds after first vibration (Display on)
3.Press and hold power key until unit vibrates
4.Keep holding power key until unit vibrates again
5.Release power key, unit performs non-vol clear and reboots.
.

Thanks very much for the instructions on how to test the Vision. I did the reset, but unfortunately: no joy. Have also reset 820 and datafields on Vision still not working right (sometimes crashing the 820). Vision is unusable. In fact, to be clear, it has never been usable for me. I realize these things happen with software but it definitely is a big frustration.

I did reset but it kept it at version 3.4. How can I get it back to a older version say 3.2 or before.

Same problem here with Edge 1030. Setting up some screens and showing others. This is crazy, I spent a lot of money on this and not useful at all.

Did you try the 1030 reset that I posted on the 1030 thread.?

Hey guys, same problem with the data field discrepancies between my Varia Vision and Edge 1030

had anyone managed to solve this?

Can you either post the HMD screen configuration file from the Garmin\HMD folder or list the data fields you using?

Yes, tried reset on both units (1030 and Vision) and continues the same way.