I installed the APK and the problem for "SIM from unknown source" is resolved. But I need help with few more things please.
1) The Data service will not work only incoming and outgoing is working.
2) I want to upgrade the OS , it is stuck on 4.2.2. How can I do that?
I have a Casio G'zOne Commando 4G LTE C811 (Verizon) and I am using it India with Vodafone Carrier.