Bringing volte back to stock based roms -z5 dual e6683

[tulasisarge]

GUYS THIS WORKS REAL DEAL

requirement
1 ) Z5 DUAL with unlock bootlooder
2 ) stock rom ftf E6683_32.4.A.1.54_R2E_India Generic_1298-7547
3 ) twrp recovery

tutorial
1 ) first of all flash stock rom E6683_32.4.A.1.54_R2E_India Generic_1298-7547
2 ) boot and check volte it should working fine
3 ) boot in fastboot volume up key and insert usb cable
4 ) flash twrp recovery
5 ) boot in twrp
6 ) backup TA"trim-area"
Firmware
OEM
LTALabel
modemst1 "baseband"
modemst2 "baseband"
7 ) flash custom rom (I flashed [MROM] [Plus version_v3 .3.9 NEW )
8 ) boot and check everything
9 ) boot into recovery
10 ) restore TA"trim-area"
Firmware
OEM
LTALabel
modemst1 "baseband"
modemst2 "baseband"
FROM BACK UP YOU HAVE TAKEN FROM STOCK ROM.

enjoy folKs AND THANK YOU bhupender kaushik4444 FROM Z5 PREMIUM XDA

SOURCE---https://xdaforums.com/z5-premium/help/z5p-volte-fix-custom-rom-t3882387