I previously had 2.1 Captivate rooted to Froyo (no problem rooting or modding with this model) - the device sustained water damage and everything was wiped out (didn't have any of it backed up on a PC / dropbox, like I thought). I received my warranty i897 ATT Captivate with 2.2 Froyo last week. I cannot get past the bootloader failure when attempting to apply update.zip (various ROMs / updates renamed update.zip). I've tried ODIN (did nothing but wipe the phone) I've tried Heimdal I've tried oneclick, Z4root, loading from CWM Rom Manager The phone is 'technically' rooted....however, you cannot apply any .zip files (ROM) or other updates. It sticks at Unfortunately, there are no other options during recovery but these; system recovery <3e> reboot system now reinstall packages delete all user data delete cache data format internal sd-card If I had more option available, I could side-step and replace the kernel that is forcing the signature. I have spent the entire weekend researching this and every 'solution' offered here and on xda corrects the issue on stock 2.1 (not the latest stock 2.2 with vendor signature requirement). All I need is how to get past the signature error / failure.