Softbricked my AT&T Active trying to go from 4.4.2 rooted to 5.0.1 rooted.

I tried to update my old phone from 4.4.2 rooted to 5.0.1 and keep the root by having my cousin do it for me. Unfortunately, he used the guide on here for the normal S4 instead of the S4 Active, leaving me with a phone that says "System software not authorized by AT&T has been found on your phone" and "SECURE FAIL: KERNEL" in the corner. Google searches are fruitless. I have tried using this method, but upon starting ODIN I get this fail message and the following:

Quote:

<ID:0/004> Added!! <OSM> Enter CS for MD5.. <OSM> Check MD5.. Do not unplug the cable.. <OSM> Please wait.. <OSM> BL_I537UCUCNE3_987011_REV06_user_low_ship_MULTI_CE RT.tar.md5 is valid. <OSM> Checking MD5 finished Sucessfully.. <OSM> Leave CS.. <OSM> Enter CS for MD5.. <OSM> Check MD5.. Do not unplug the cable.. <OSM> Please wait.. <OSM> AP_I537UCUCNE3_987011_REV06_user_low_ship_MULTI_CE RT.tar.md5 is valid. <OSM> Checking MD5 finished Sucessfully.. <OSM> Leave CS.. <OSM> Enter CS for MD5.. <OSM> Check MD5.. Do not unplug the cable.. <OSM> Please wait.. <OSM> CP_I537UCUCNE3_987011_REV06_user_low_ship_MULTI_CE RT.tar.md5 is valid. <OSM> Checking MD5 finished Sucessfully.. <OSM> Leave CS.. <OSM> Enter CS for MD5.. <OSM> Check MD5.. Do not unplug the cable.. <OSM> Please wait.. <OSM> CSC_ATT_I537ATTCNE3_987011_REV06_user_low_ship_MUL TI_CERT.tar.md5 is valid. <OSM> Checking MD5 finished Sucessfully.. <OSM> Leave CS.. <ID:0/004> Odin v.3 engine (ID:4).. <ID:0/004> File analysis.. <ID:0/004> SetupConnection.. <ID:0/004> Initialzation.. <ID:0/004> Set PIT file.. <ID:0/004> DO NOT TURN OFF TARGET!! <ID:0/004> Complete(Write) operation failed. <OSM> All threads completed. (succeed 0 / failed 1) <ID:0/004> Removed!! <ID:0/004> Added!!

If anyone could help me make my old phone work again, it would be very appreciated.