I had a similar issue with a njoy starter kit I bought for lady... i left the unit on the charger for three hours and tada! ... it finally registered/reset or whatever and now works fine.
I tendto stay away from Named brand an stick stricty to generic model number units IE: 510, 901 ETC ... hope this helps![]()
madvapes.com has great generic kits at super prices... i got the 510 Mega (no box) and it works like a champ!