GravityBox killed 4G

[nestori]

I've installed GravityBox for Marshamallow and everything went OK, but suddenly I lost signal, and 4G connection. After a few restarts, my signal come and go, so I uninstalled GravityBox, but signal is still poor and 4G is gone. What can I do? Thanks

 

[nestori]

I've lost 3G either

 

[bablu048]

I've installed GravityBox for Marshamallow and everything went OK, but suddenly I lost signal, and 4G connection. After a few restarts, my signal come and go, so I uninstalled GravityBox, but signal is still poor and 4G is gone. What can I do? Thanks

Try this
Remove SIM(s)

From fastboot mode. Try the following command.

fastboot erase modemst1
fastboot erase modemst2
fastboot erase cache

Reboot and put SIM(s) back!

 

[nestori]

Is that safe?

 

[minimale_ldz]

Is that safe?

Yes