Hey, I'm no BB expert, but if you uncheck an app from the list when updating the device, I think that doesn't just exclude it from being installed, it will actually remove it.
I know some Pearl's need the DST patch and some don't (it's by the color...I guess the newer colors came out after the black and white ones?...but you should check to confirm).
Are you a US subsciber on international roaming? Did you try asking your phone support like AT&T or T-Mo? They're decent help.