[d-wade]

i have 4.5 beta, how do i downgrade to 4.2.1.109?

[CardiacSmashin]

Same way you upgraded only with what os you want. Just remember to delete the vendor file before installation.

Posted from my CrackBerry at wapforums.crackberry.com

[d-wade]

cool thanks

[Duvi]

Ummm... no.

Go to Control Panel... Uninstall Programs.... then uninstall 4.5


After that load DM up and load App loader again.

[spark916]

well i dont know if this would be a same topic but im trying to get a tmobile os cause im tmobile but i have a unlocked phone from cingular would i have to delete the vendor

[Pete6]

well i dont know if this would be a same topic but im trying to get a tmobile os cause im tmobile but i have a unlocked phone from cingular would i have to delete the vendor

Woulda been nicer to have started another thrhread but here's what you do.

Look at the top of this forum to find the latest compatible OS for your phone and download it to your PC. It does not have to be a T-Mobile OS.

Uninstall any other Blackberry OSs that may be installed.

Install the one you just downloaded.

Delete the Vendor.xml file in C:\Program Files\Common Files\Research In Motion\AppLoader.

Make sure that you have v4.3 of Desktop MAnager installed and connect you phone.

Follow the prompts.

MAKE SURE YOU HAVE A BACKUP before you start the upgrade process.