I would recommend caution when upgrading this modem past software version 7.7.4r1. I upgraded to 7.8.4r4 some time ago and was unable to find a functional configuration, eventually downgraded back to 7.7.4r1, and have had few problems since.
In summary, it seemed to me that bridge mode functionality is broken or inaccessible in 7.8.4r4. I used a command line configuration change documented on Motorola's support site to enable bridging in both versions. With 7.7.4r1, the box functioned as expected. The upgraded 2210-02 worked fine in NAT mode, but not when bridging. I tried multiple config variants. Reverting the software upgrade resolved the issue. At the time I found anecdotal evidence on the web about such a problem in the later version(s), but I didn't think to save any links.