Repeated calibration failure with Feit Electric LED Globe - Use Bypass?

Hi Everyone,

I have a Dimmer2 connected with Neutral, driving a Feit Electric LED globe (this one). It draws around 4W at 100%.

It's working OK (as in, it dims, and acts generally as expected) with firmware 1.7.6, without a calibration (?).

I upgraded all my Shellies to 1.9.3, and this globe started flickering intermittently. I figured it was calibration related. Tried to calibrate it, in both leading and trailing edge (it should be in trailing edge, but after this didn't work, I tried leading edge). It always gets to ~50% then fails. I've tried a number of different firmware versions, 1.8.5, 1.9.3, 1.9.0 - all these have the same symptom of failing the calibration.

I have another Dimmer2 driving a Tala 3W LED bulb, and this calibrates and works exactly as expected - in v1.9.3 as well as others.

I bought two Bypasses, figuring they might be useful for smoother dimming at low wattages, but I see no mention of using them with a neutral - only in situations where there is no neutral. Is it safe / useful to connect the bypass between the output and neutral, if the neutral is also connected to the Shelly? In the Aeotec Z-Wave dimmer I have in another install, they recommend a bypass for any load less than (I think) 30W, or for any LEDs that are prone to flickering.

For clarity, I'm asking if putting the bypass in parallel with the load will help (as other dimmers do this). I've attached a sketch if that helps!

Thanks in advance for any help! Other advice to get it to calibrate is also appreciated!

I'm having what sounds like exactly the same problem. I've tried several different LED and incandescent lamps with no luck. When I connect to the dimmer it says that it is not calibrated so I click the thing to start a calibration and the lamp gradually gets brighter until it reaches about 50% and the lamp goes out then a few moments later it says calibration failed, I think it showed "error 1" but I was not able to find any useful references to that. The dimmer sort of works, but it won't go to full brightnes using the slider. I got it to calibrate once using the bypass setting but the result was even worse with the dimming range completely messed up. This is a Shelly Dimmer 2 with 20210115-103951/v1.9.4@e2732e05 according to the UI.

Ok thanks, so error 1 is "there is not a change of the operating voltage when the device is wired without N."

This is wired up with a neutral, do I need to set that somewhere in the firmware? Perhaps I got that error when I selected bypass just to see if that would work. I tried running the calibration dozens of times with various settings and it never resulted in correct operation.

I just tried this again, I made sure "Calibrate with bypass" is NOT selected and it still fails with "Calibration failed: 1" The description of the error doesn't make sense to me since there is a neutral connected.