write iRules for tftp to work on F5

Hi I have the same issue ! Cannot balance TFTP traffic UDP on 69 as the way of TFTP is working has to be tricked! Is behving like an ACTIVE FTP (Trivial FTP) so he sends initiations of the transfer on the 69 but after the response of the server it will use the ephemeral port used as a source ! Is there a standard way to make it work just by using the tftp profile? The documentation is not clear enough ! Regards!