I have an Incredible, so not familiar with Eris, but I want to root my wife's phone and install XtrSense 4.1, as it seems to be a fast and stable ROM with no tweaks needed. So, here are the steps: 1) One click root on XDA, install the rootme.zip file, reboot and should be rooted. 2) Run a nandroid backup 3) copy Xtr ROM to root of SD, wipe, and flash via "install from zip" Is there anything I am missing, seems straightforward. The one step that confused me is this: Wipe SD:ext partition What does that step do? Thanks in advance for help and comments.