Transformer factory calibration

Hi,

I tried to do a factory calibration for the transformers. The option is under transformer calibration but when I press it I have only an error message.

What is the right way of doing factory calibration?

My issue is why I think calibration is needed that at set-up clamp A was attached to phase 3 and clamp C attached to phase 1.

I wanted to change the clamps to the right phase but then the readings are off. I also tried turn off phase 1 breaker then Shelly also does not read anything on phase 3 with clamp C as well. Phase 2 with clamp B is still working.

Now I changed back clamp A to phase 3 and clamp C to phase 1 and readings are OK again.

How should I change the clamps to the right phase?

Maybe factory reset would solve the issue? But I'd like to avoid it if possible not to lose my data.

Thank you for the comment!

If factory calibration cannot be executed by user I think it should be removed from the settings.

Can you advice how should I do the factory reset so my readings will be right after I change the clamps to the right phase?

Should I first change the clamps to the correct phase (measurements will be off) and then do a factory reset?

Is there a way to import my saved data after factory reset so I won't lose all previous readings?