Stuck in Android System Recovery (3e). Newbie needs help!

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http://forum.xda-developers.com – Hello. I recently switched from the iPhone to android and I rooted using the motochopper.zip. After I was done, I pressed the power button and then pressed it again to see the facial recognition lock. Then, it just froze. I pressed and held the power button and it has been stuck on the android recovery loop. I tried putting it into "download mode" as people have recommended and download this "custom OS", but it's stuck downloading. I've tried searching it up, but people are saying to "flash the ROM" or using "Odin". Since I am a new android user, I have (HowTos)