g925a reactivation failed help

Using Version...1.0.0.0060
Selected Port SAMSUNG Mobile USB Modem #2 COM19
Selected Model GT-I5500
Selected Task SAMSUNG REACTIVATION Remove

Searching phone...
Device Found..
MODEL=SM-G925A;UN=05157DF5C2A8E012;CAPA=64;VENDOR=SAMSUNG;F WVER=0202;PRODUCT=KLUCG8G1BD-E0B1;PROV=PASS;
Init ok..
Device := SM-G925A:USA:ATT:2:G925AUCS7ERC1
Fail-flash..
Possible New BootLoader Try Downgrade and retry...
Finish...

!!! Fail !!!!
Restart Phone if not auto...
Total Time Take...00:00:14
Log Saved