Tried to expand an IPO 3.2(55) by replacing a 16 port DSM (ver 5.2) with a new 30 port DSM (ver 9.0). Tested the DSM30 on an IPO 7.0 first then did the swap at the customer site. Existing phones (5410D & 5420D) would not work and new 5420D phones would not work. Just got a 'please wait...' display on the phones. We are being told that our mistake was testing the DSM30 on the IPO 7.0 before trying to install it on IPO 3.2 (55), because the firmware automatically was updated making it incompatible. True or False? Is there any way out?