I cant acces service mode fully. Is this the same as u? But I can change my network both freq. Try to type *#2263# on dial app, if not work try to change value keystr and factoryapp file on efs folder (device should be rooted to view all the files) . Change it from ON to OFF and or OFF to ON. It working great on me
XDA Developers was founded by developers, for developers. It is now a valuable resource for people who want to make the most of their mobile devices, from customizing the look and feel to adding new functionality. Are you a developer?