I don’t expect that phone will provision if it can’t find 000000000000.cfg or 0004f201f2c8.cfg in the server root. Can’t say for sure with a phone that old, but one of those two files is required to be present for SIP 3.1 and higher to provision.
Also, are you running a TFTP server on there? If you are, you should know what directory you have configured it to run from. Be aware that it offers no authentication of any kind (first T stands for trivial.)