need help! completely stuck

HI there! just buy on ebay HTC A9 ATT. cid -CWS-001 MID-2PQ12000. its ATT locked and s-on. ATT IMEI blacklisted!!!!!!! then i buy unlock code from HTC premium service to unlock gsm-not working. The phone was a demo phone(i think) coz got little burned lcd. the firmware was 1.27.502.5 and for unlock service phone must have a stock firmware. but its not work for me. Then i try root it to flash previous stock firmware and delete all, now cant restore it cant mount in TWRP 2.8.70 the restore from sd (rename to 2PQ9IMG)not working (19_RU...... mistake),then after root i reflash stok boot and recovery then run 1.27.502.5 RUU exe- OK ,but bootloader show its unlocked and The firmware is modified????????????
need links :
TWRp 3.0.00.1
ATT stock system .img !!!!!!!!!
ATT stock boot img
ATT stock recovery.img

JUST NEED TO BACK 100% STOCK to try unlock it. not planning s-off.
Any solution?

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