Hi,
I have 2 MPPT 75/15 controllers. Since last update I can not connect to one of them. The other one works ok.
The problematic one gets stuck at 20% when opening. It can be connected via other phone (older iPhone) but not newer one. it's serial number is HQ1839GKWUL.
I've also tried ipad, 2 different iPhones (8 and 11) and macbook laptop. it only works on old iPhone 6.
After last update it got stuck at updating firmware and after that technician did an USB/laptop update. It works on his android phone. So now it has the latest update installed (both have)
Should I return it?