Download from ROM Toolbox, at the prompt after it completes do nothing. Hold the power button, select reboot, select recovery. Flash the ROM from there. it'll be in your SD card in a folder called romtoolbox-> downloads -> revnumbers Yes, when flashing from OTA (or ANY ROM that's not CM7) to CM7 you should wipe data and cache. The general rule is that if you are switching to a different ROM you need to wipe and cache, if you are updating the SAME ROM, you only need to wipe cache. wiping data deletes all of the settings within the OS and the apps. This needs to be done when switching ROMs because each ROM has a difference set of settings, so the data for those settings is completely different.