BB OS 4.5...175 and above have memory access restrictions
since phones like 8230, 8530 and 9630 came out with that OS version already there's no known way to enable mamory reading,
and since there's no older versions hence no downgrade
Beside these there are lot of issues in Blackberry Cdma like corrupted reg id
leading to no spc access
all can be resolved
Some particular version of firmware not allows to access proper addresses need to be downgraded to only fixed versions
etc
bla bla ......
br,