a) Remove all BlackBerry Device Software from Your PC

b) Install OS of Your choice

c) Remove “vendor.xml” from: C:\Program Files\Common Files\Research In Motion\AppLoader

d) Connect Your device to PC using USB cable (Mass Storage Mode have to be TURNED OFF)

e) Run Desktop Manager

f) Run Application Loader

g) Choose Your OS and “Install older”

h) DM will show You aplication which will be installed on Your BlackBerry

j) Choos to create or not backup file and click next