HOW TO KEEP CARRIER CSC (WORKING VOLTE!) WITH XAA CSC, INCLUDES ABILITY TO DIRTY FLASH, NO BLOAT!(XAA/ATT(or your carrier here)/ATT(or your carrier here))
1.follow the carrier switching guide
2. When flashing BQL1, flash AP, BL, CP, and HOME_CSC
3.check in about phone and you should have XAA/ATT/ATT
4. PROFIT???