I mean both ... gsm and LTE.
Here are some :
http://forum.xda-developers.com/oneplus-one/general/guide-unlock-aditional-bands-qualcomm-t2877031
http://forum.xda-developers.com/mi-note-pro/development/how-to-unlock-lte-frequency-bands-mi-t3215880
These procedures are rather general, and not exactly mapped to the phone. Please try and find one specific to your phone...in any case you can try the one listed above.
I have these tools...though they are also available on internet through file sharing site...let me know if you have difficulty in finding them...i ll upload them.