Hi, I purchased Galaxy Note 2 GT-N7100. It came with some Chinese or Hong Kong rom 4.1.1. I installed UK rom 4.1.1 on it with Odin 3.09 and installed successfully and further updated through OTA to 4.3. When I inserted the SIM and want to make a call it gives error "Network not registered". I thought may be it is the UK rom problem. I reinstalled the UK rom 4.1.1. and checked but the same issue. Then I downloaded the Chinese rom 4.1.2 and tried to install through Odin but failed. I tried to install UK rom again but failed. After searching the forums, I came to know about this KNOX issue. It is set to 1 on my phone and now I am unable to install any other rom. I tried to install Chinese rom 4.3 but failed. Now my phone is running UK rom 4.1.1. I can move to receovery mode and download mode with no problem except the "Network not registered error" and further it is not getting the update through OTA as it is giving error "Your device has been modified. Software updates are not available". Please help me to solve this problem. I want to install Chinese rom now.