Hello! After upgrading from android 6 to android 7-, there were problems:

1) The camera overheats and becomes boiling water during video shooting and the phone turns off for at least 20 minutes!
2) In Androde 6, I only worked with two sim cards - after upgrading to android 7 - only one SIM card works during the conversation - the second is inactive and on the turn if the second SIM card is not active the first one is not active !!!
3) Missing the compass - would like to return it!
4) The battery holds now a maximum of half a day !!! Although on the android he had to keep a maximum of a day!
5) If you turn on the navigation after 30 minutes overheating the battery and the phone turns off for 20 minutes minimum!

Help solve these issues!

please try to update to the latest firmware version.