HELP TM822

Hello, not sure if anyone can help me I am using CNR 8.1.3 and Packet Ace, Im not a pro but know my way around, I was able to get the internet side of the Arris TM822 to work however the MTA side I am stuck, it seems that the tftp server it is pointing to is the wrong one, however in cnr i have it set to the correct servers. the mta is stuck in telephony tftp and i can not get it to work please help