I rooted my Motorola Droid using z4root as I have a Mac and could not use the other methods. I installed the 2.2.1 ROM when it was made available. I then installed ROM Manager, which installed Clockwork MOD and nandroid. I attempted to install the Sapphire ROM so I rebooted into recovery mode which opened the clockwork mod recover. I backed up my phone using nandroid, wiped my cache and data, and tried to install the sapphire zip which i renamed to update.zip. My phone rebooted to the android setup screen and it did not install the rom. So i've searched and searched and watched countless youtube videos. I tried to completely go back to stock and was unable to apply any .zip files to change anything. So i've come here for help!! Please let me know what I'm doing wrong! Thanks!