asterisk users - May 2005 - Cisco 7960 tftp "not null terminated"

Has anyone seen this problem: I recently purchased new 7960g's with
sccp firmware on it. When I try to upgrade the firmware to SIP the
phones seem to be making malformed tftp requests. The logs shows:

sending NAK (4, Request not null-terminated) to 192.168.0.55

Thanks in advance,
Josh Laroff