BB 8520 detected by windows as unrecognized device.

Dear support,
I have BB 8520 which can't be detected corectly. I have install Desktop manager 5.0 B37
and BB USB & modem driver (DM5.0.1B73)
Do I need to install the device software too??
Thanks and to get a reply soon!

Hi and Welcome to the Forums!
First -- this is not "support"...at least not formal support. This is a user-to-user support community of like-minded kind souls who try to help others out as best they can. This is not part of your formal support. Everyone here is a volunteer.
Next...I suggest a clean start over...here's a procedure:
I suggest the following steps (insert plenty of reboots of your PC...not just restarts, but full power down reboots). Also, it is advised that you be logged into the PC on an account with full admin rights. Further, under Vista/Win7, use the "Run As Administrator" option for everything.
1) Remove your device OS update package from your PC (add/remove programs)
2) Cleanly uninstall the RIM DTM software:
KB02206 How to perform a clean uninstall of BlackBerry Desktop Software
Some have reported that there are more registry keys to remove than are discussed in that KB
Others have reported the use of a registry cleansing tool to also be helpful
3) Get a fresh download of the RIM DTM software:
https://www.blackberry.com/Downloads/entry.do?code=A8BAA56554F96369AB93E4F3BB068C22
Choose the version that is newest and (if applicable) compatible with your PIM (if you are synchronizing via USB):
KB12268 Applications supported by BlackBerry Desktop Manager for synchronization
4) Download (to your PC) a fresh copy of your device OS package from your carrier:
http://na.blackberry.com/eng/support/downloads/download_sites.jsp
5) Install DTM to your PC
6) Install (also to your PC), the device OS package
Hopefully that will get things going again. If not, please report back with details and specifics about exactly what does not go well. For instance, "can't be detected corectly" doesn't really tell us much...a detailed description about what you expect to see and what you actually see would help us to help you.
Good luck and let us know!
Occam's Razor nearly always applies when troubleshooting technology issues!
If anyone has been helpful to you, please show your appreciation by clicking the button inside of their post. Please click here and read, along with the threads to which it links, for helpful information to guide you as you proceed. I always recommend that you treat your BlackBerry like any other computing device, including using a regular backup schedule...click here for an article with instructions.
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BB 8520 detected by windows as unrecognized device.

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