how to unlock e3372h-607 airtel india

14.41.34 : ————— Read device information ———————–
14.41.38 : DLOADVER : 2.0
14.41.38 : Model : E3372
14.41.39 : IMEI : 866850020091808
14.41.40 : SwVers : 21.200.07.00.284
14.41.40 : IsoVers : UTPS23.015.02.07.284
14.41.40 : PrdName : E3372
14.41.40 : DloadType : 0
14.41.41 : Auth.Vers: : 1
14.41.41 : New HiSi-TYPE 3 Identified. Sec. v4
14.43.15 : Unlocking modem … Failed!
14.43.16 : Can’t get Access!

which firmware do we flash to get unlock
do we tick rebuild efs for this modem or not

regards…