I rooted my friends eris with the htc eris root app. I then installed a rom called kaosfroyo. When my friend tried to log into gmail and got the box where you have to type the letter&numbers before it logs in, it wouldn't recognize the text he entered even though it was written correctly. He tried over 20 times. I did wipe data factory reset before flashing the rom though. He was able to use the browser and make calls also.
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