Help with Newb mistake

I apparently botched rooting my Transformer (b60). I did manage to install Clockwork Recovery though.

So now it will no longer accept the official Asus firmware updates, not will it accept a custom ROM.

Anyone know how to fix this?
I did a factory reset, but same problem.
I have tried updating the firmware manually, tried renaming it update.zip and putting it in root on SD card.
Every time it either says update aborted or I get the triangle/exclamation point error message.

Thanks in advance

Give this a shot....seems to work for the majority of users.

Asus Transformer NVFlash Stock 3.1 & Stock 3.2 Recovery Roms (Unbricking Tools)

FYI...this will give you a completely stock install, and will erase all of your info!

Thank you, will check it out.