Never got around to downgrading my Device Manager. Instead I installed the OS on my laptop's harddrive (just clicked on the os.exe file). Then I ran a program called BLACKBERRY MASTER CONTROL PROGRAM
which apparently just loaded the 5.0.231 os using the Blackberry Loader program. Might have been able to do the load myself with just Loader.exe...... I did NOT do a wipe or anything else to my Tour 9630 in preparation of the os load.
Took less than 45 min start to finish (10min of hesitation on my part out of fear - what if it wiped my phone and then failed to load
)..... and bingo, got new OS which seems faster, and my GPS programs work, and SMS thread, and email, and browser, and phone. Have not tried the bluetooth yet. Needed to update one program (Quickpull Plus) and most need to re-enter permissions. But no problem.
STILL DON'T KNOW WHY BLACKBERRY DEVICE MANAGER KEPT GIVING ME AN ERROR