In my experience in flashing Blackberry's to Cricket service, I have only been able to flash the Pearls, Curves, and the Storms with the newer version of QPST.
When I have tried it with the older models such as the 8703 and 7103's it has corrupted the SPC.
However, on the older models, I always use the QXDM or CDMA workshop to flash the PRL to the phone.
There is a solution out there somewhere to fix this problem however, it hasn't been posted.
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