Just seen your review on amazon and I have D:A38 D:A49 , D:A41, D:A 41
They have been imported by a Polish company INNPRO Robert bledowski.
Looks like I will be trying to flash these later today 
looks like it can be hit and miss which versions you get. I wonder if the importer is different, it’s maybe a problem with Amazon that they send you a GoSund Up111 smart plug and suppliers can be different.
My first 4 were D:Axx and I ordered a second set which arrived this morning “made in china may 2021” As it happens Amazon said this set were undeliverable having been damaged in transit so I thought I would give it a go to flash these, successfully
The first 3 went through with no issues, the fourth failed to backup its firmware but I was asked if I wanted to flash anyway and that was successful. So now I have ordered another 4.
I do think they need calibration as “a resistive load should have a powerfactor of close to 1” and the power factor is all over with these.
luckily I have a power measuring socket so this should be easy
Hi all,
does anyone know of a smart relay that monitors power? as well as switching 13A?
Would this be suitable for you
Yes Graham it would do the job. I also found a shelly one that will work as well.
Thanks