Cannot Scan QR Code in App Samsung Galaxy S7 Edge

[ninjatill]

And I would recommend not running the device in the black, conductive foam it ships in. You should use a breadboard. The foam is mean to dissipate ESD during shipping. There is some discussion of that here:

Xenon - charging LED flashing, no LiPo connected

After further research: they only keep flashing when they are still in the black foam (from delivery). They behave normally in a breadboard. In the foam they sometimes don’t flash, but after wiggling a little, it is possible to get them starting to flash. Pressing the foam on the sides close to LiPo connector will always do the trick in my case. Also, in the black foam, the D7 led is dimly on (except when forced to HIGH or LOW). So maybe there is a connection…?