[Trimix]

Thinking about doing the upgrade to 4.5 but in case I need to downgrade back to Tmobile's OS 4.2.2.180 where can I get it?

Or, if I do a backup before the upgrade and then need to downgrade, is it as simple as doing a restore with the older OS?

[jsconyers]

This should help you out.

How do I downgrade the OS on my BlackBerry? - BlackBerryFAQ

Yes, you could restore the backup you create.

Honestly, I don't see you needing to downgrade. 4.5 is a stable OS with a lot of features.

[Trimix]

Yeah I saw that BBFAQ link. But the link on that takes you to the most recent OS.

Just out of curiosity, which database corresponds to the OS when you do a backup/restore?

[xyrcncp]

If you want an older 4.2, you could search for it and it could be from any carrier. As long as you follow the install directions you will be fine.

[Trimix]

Can anybody confirm that a downgrade can be done with a simple restore?

[makedonce]

u need to delete the new versio of the OS from ur computer. Once u connect the BB, you will be prompted to downgrade. Of course u need to have version 4.2 on your pc

[rachamphetamine]

The downgrade works the same way as upgrading. If you scroll to the bottom of the first post in the latest OS for the 8320 thread, you'll find links to previous versions. Just click through those until you find the one you want.