I imagine all you clever lot already know this, but it caught me out, so I'm posting it just in case.

Upgraded a 7100 to 4.70 (new mp10a) and the I couldn't dial out through the 4trm module on the unimodule.

It turns out that with 4.70, you need an EPLD version of at least 5 (mmc 859) for it to work.