A) download and istall BBSAK
B) Create a backup using Desktop Manager
C) Run BBSAK, connect the device using a USB cable, click on "Backup / Restore" tab (in newer versions of 1.6)
IMPORTANT: Selecting WIPE option will erase all data from our BlackBerry!
1) Take a leaky OS for your BlackBerry device and then Install
2) Delete the vendor file as mentioned above
3) Remove tools internal RIM (from Add / Remove Programs Windows manager)
4) Open the "Backup / Restore" tab again and select "Load OS" option
5) Follow all the steps on screen
After running the update Desktop Manager, select Backup / Restore and restore your data from backup.
I hope this trick helps you to learn to update the os on your blackberry
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