[Q]Possible to upgrade to Android 5.0 on CHU vision i9082? topic

Hello,I'm using the China Unicom (CHU) version i9082 with Android 4.1.2,and I want to upgrade it to 5.0
I noticed there are not any offical 4.2.2 rom for CHU version,so I have no way to upgrade to 5.0 due to the roms are based on 4.2.2
So could any one tell me if it possible to upgrade my phone to Android 5.0?
Thanks~