I had to deal with the exact same problem with the same phone heres how i done it.
1. Read PM Field 120 with jaf cracked & the usb cable which came with the phone
2. Open the PM file with this program
http://www.4shared.com/file/69057368...unter_BB5.html & reset the counter to 0
3. Write the PM file back to the phone with Jaf cracked