[Rutland]

I'm attempting the downgrade back down to .40.

Assuming that all works out okay, is it even possible to try to re-upgrade to .53? Is the link even still there? Can you still download it?

I can't find it.

[jorGeorge]

Yes it is still possible. .53 was leaked on CrackBerry days before it became official (and then was pulled). You can still download it from CrackBerry.