Hi marco,
Yes, I have done this a lot. You have a 9300 right?
I always follow this guide from the crackberry website with my own modifications. It looks complicated, but it isn't. I have had no issues yet:
ELITE1's OS UPGRADE GUIDE
1) Uninstall any previous Blackberry Operating System (OS) from your PC. (Go to Add or Remove programs on your computer, it will be called Blackberry Device software vx.x.x for the Blackberry xxxx Smartphone)
Make sure you have the latest version of the Blackberry Desktop Software (7.1.0.37)
2) Download your new BB OS to PC. Download the latest os for 9300 here (ignore the austria bit, that doesn't matter):
http://forums.crackberry.com/blackb...s-6-0-749-curve-9300-t-mobile-austria-760907/
3) Following successful download, run OS file to install this OS on PC. (this only "extracts" the OS files to your computer)
4)On BB, go to BBM Options, scroll down to Backup section. Ensure Remote Backup is enabled AND also conduct a Local Backup to media card.
5) Connect BB to PC. Open the Blackberry Desktop Software and backup device. Close Desktop Software.
6) On PC, delete Vendor.xml file:
use this program (
http://forums.crackberry.com/hybrid-os-f224/vendor-xml-remover-v1-0-a-678515/) to remove all the vendor files for you. (This is where the austria bit doesn't matter anymore).
OR
manually delete the vendor.xml files located here: (I do not recommend this, as the vendors sometimes place the files in other locations than expected and then you won't get the update to work)
(If manually deleting Vendor, always hold down SHIFT and press DELETE to permanently delete.)
•64-bit: Computer/C:/Program Files (x86)/Common Files/Research In Motion/AppLoader
•32-bit: Computer/C:/Program Files/Common Files/Research In Motion/AppLoader
7) Disconnect the internet from you computer, this will force the program to look for a local installation.
8) Run the Blackberry Desktop Software again. The update should pop-up as a "local installation". Follow the onscreen instructions.
9) After loading OS, perform several physical battery pulls over first 1-2 days for OS to "settle in." Perform first battery pull very soon after OS is loaded.
I have also used BBSAK to install an OS on completely wiped Blackberry's, but it doesn't make a difference in my opinion.
Hope you manage
