[Xperia Z3 Compact General] mikuru396:
Part 2: Unlock GSM/CDMA band(s)

11. Go to Start -> All Programs -> QPST, open "QPST Configuration". In the "Ports" tab, click the "Add New Port..." button in lower right corner.

12. In the Add New Port window, untick the option called "Show Serial and USB/QC Diagnostic ports only".

13. You should find an entry with the name saying z3c USB Modem. Select it and press OK.

14. Make sure the newly added port is "Enabled", under "Phone" block is MSM8974, Link is "USB".

15. Keep the configuration application running in background. Close the application will loose your connection to the phone.

16. Navigate to the installation path of QPST, in the /bin folder, find and execute "RF_NV_Manager.exe".

17. Go to "Setting" -> Comport, select the correct port you created in step 14.

18. In the top menu, "File" -> "Read from Phone". It should start reading your phone but take times.

19. After reading operation finished, in the lower left panel find the item with number 1877 (NV_RF_BC_CONFIG_I).

20. In the right panel, take a note on the originial value in case of recovery need.

21. Open mzTool, under "Band Preference (Bit info)", select "Decimal" under "Input Radax". In the "RF BC Config", enter the number you noted at step 20. It will list out all your current band supported by your headset, in the bit information box.

22. Still in mzTool, go to next tab named "Band Preference (NV Value)", select the band(s) you need. You can select all, but I personally recommand what you really need plus "[60] Reserved for BC10-1700", at lest those originally come with your phone.

23. After selecting band(s) you need, Copy the decimal value in the "RF BC Config" box below the selection area, and remove all space in between.

24. Go back to QPST again, find item #1877 (NV_RF_BC_CONFIG_I), paste the new value you calculated in step 23 into the right panel, and press the "Write NV"Button.

25. Go to "File" -> "Write Changes NV Items To Phone".

26. Close and reopen "RF_NV_Manager.exe", repeat step 17-19. If #1877 show you the value same as the one you calculated in step 23, then you are OK to proceed. If it revert back to the originial value (you should noted down at atep 20), sorry this mod is NOT for your headset and proceed to last part for quitting diagnositc mode.

27. Close RF NV Manager, unplug your headset and reboot it. If you got reception after reboot, then you are good. Please give thanks to [MENTION=5733862]BlackSoulxxx[/MENTION]

27a. Open dialer, type *#*#7378423#*#* (*#*#SERVICE#*#*), goto "Service info" -> "Configuration", you should see your unlocked band. If not, that means your phone reset it while reboot. You can do nothing unless you know how to disable the reset.

27b. If your phone cannot get signal after the mod, flash your phone with the stock FTF, do NOT select anyone under "Wipe:", select all under "Exclude:" but keep "BASEBAND" selected. This should flash the originial baseband firmware, hence remove this mod.

27c. If you still cannot get any reception, flash the whole stock FTF. This will wipe all your data, but reset it to factory installed status.

28. You are done for this section, you may continue for LTE band(s) unlock, or jump to last part for quitting diagnositc mode.