Share a photo of the module.

 

I just sent mine in. I would not open the back.

 

Thank you for your response. I will upload a photo of the module. There is no terminal labeled AC.

 

Doesn't seem obvious to me either. If I was placing a bet, it would be on the two pads in the lower right.

After the battery is in, take your tweezers and just start touching stuff. Touch the silver pads you can see on the PCB below to all the other silver pads and maybe even the top of the battery or the strap. Each time, check the display to see if it's turned on or reset. (If it's already on and appears to be functioning correctly, then you probably don't need to worry about an AC reset anyway.)

Seems really lackadaisical, but that's how I do it.

 

I assume arrow on the sticker should point to location of terminal.

 

Thank you very much to both of you for your feedback. After trying it out since then, I found that shorting the GND contact on the PCB and the battery suppressor resets it. appreciate. I will also write it down as shared knowledge.

 

My guess would be these two at the same time with metal tweezers or a paper clip.

 

I am facing this problem right now, may I ask what is the battery suppresor? can you draw some arrows on the picture that you posted?

 

 

I added a photo.
It should reset if you short out the parts pointed by the two arrows.

 

Thanks for fast reply! I found out it's not I am shorting the wrong position, it's the battery already dead

But I have a couple more Regulus, so still have opportunities to verify it in the future! If I do it again, I will let this thread know! Let the share knowledge pass along!