[Q] Troubleshooting Samsung Epic after Froyo install

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Hey there. I'm new to this forum, and I need help! I updated my Samsung Epic to 2.2 today without a hitch. Following online instructions, I downloaded the 2.2 software, copied it onto the SD card in the phone, entered recovery mode and loaded the update.zip file. The phone rebooted and everything's fine. Then, I took my girlfriend's Epic and did the same thing. But, when the installation appeared to be done, and the phone restarted, it didn't restart. Instead, I goes back to the recovery mode and I can't get it to do anything else. I've removed the battery, turned it back on, but it just goes to that screen. I don't know much about this, but it seems like it can't find the system software. Any ideas? Thanks in advance for your help!