Good morning,
I wanted to try connecting mobile to rc via OTG, but I couldn't.
I set a custom channel in 5.8GHz and after of that my mobile (Asus ZE550KL / Android 6) never could to connect to RC it don't see any wifi.

If I switch on only rc it sees Spark-rc-... wifi and connect to it.

Opening the app I read RC connected.
If I switch on the aircraft when it links to RC I read for one second "GO FLY" and after "DISCONNECTED"!

Damn me!

I tried to reset wifi by aircraft and rc power buttons for nine seconds but o bip happened to me.

I could reset WiFi of the aircraft and I could fly controlling it by the phone.
Now the trouble is that I could not link RC to aircraft.

[SOLVED]
1) turn on spark, press button for approx. 6 sec (you need to hear 2 beeps) unpress button and turn spark off
2) turn on spark second time and press button for approx. 9 sec (you need to hear 3 beeps) and trun spark off
3) turn on spark third time and press button for approx. 2 sec (you need to hear 1 beep) and try to connect RC.

andreascarfo Posted at 2018-1-11 04:10
[SOLVED]
1) turn on spark, press button for approx. 6 sec (you need to hear 2 beeps) unpress button and turn spark off
2) turn on spark second time and press button for approx. 9 sec (you need to hear 3 beeps) and trun spark off

Glad you solve the problem and share the method with us. Please inform us if you have other problems.