Do you sub to Starchoice? Reason I ask is if so it won't hurt to MR that 405.
Proceed as follows:
Master reset the 405.
Go to "manually tune frequency" Point it at W5 and enter IF frequency 1430. Back out of the menu and tune channel 204.
Satellite signal should lock.
Go into EMM provider screen and enter 4160, and it should turn green with "correct signal found" it's now in the HITS datastream.
Only do this if your 405 is currently subbed so you can go back to Starchoice with it and get their maps again. 905
should work the same way.

:up
(I don't have a 905 but this should work since all the DSR's have similar menu functions)