2.005 firmware contains changed EZRider to fix a TMC bug in Germany.
BorisM and wackid
Puting these two ideas together: I read wackid as saying that 2.005 works with the old ezrider; and BorisM says that ezrider was changed for 2.005 in order to fix the TMC bug in Germany.
Therefore, as I am in the UK and don't want / need the German TMC, it may be that if you use the old ezrider with 2.005, you can get to use the updated maps but the TMC won't work.
It must be worth a try. I guess the worst that can happen is either it does not work or that the other TMC code left in the f