I was trying to do a nandroid backup following this (YouTube - Motorola DROID - How to Create a Nandroid Backup - Part 1) guide, but when I rebooted into recovery from step 4 I just got the triangle with the exclamation mark screen. I think it's because it was a different version of droidroothelper, which didnt have the 99.1b option, only 99.0b and 99.3b for recovery images. How can I get to the recovery mode screen now?