The title of this article is correct, I believe I just upgraded my G1 from Android 2.2 to Android 2.1. Over a week ago now, I had upgraded to CyanogenMod 6.0 RC1, and every day it seemed to slow down a little, and get a little less reliable. Sending messages, launching the phone, or checking settings would sometimes lock the device up for 10-20 minutes, and other times it would reboot the entire phone.

I flashed the CM 5.0.8 image, wiped, and flashed the image again and my phone came back with all of my settings, applications (I was previously using Apps2SD, which doesn't yet work in CM6), and my phone responds about 30 times faster than the G1 on Froyo.

Although I love the idea of CM6 and Froyo on the G1, for me the device was much too slow and lacked stability to continue using it. I'll switch back when the following criteria have been met:

1. Android Marketplace background threads don't crash
2. Settings/Phone/Messaging/Home Screen don't take 20-360 seconds to load
3. Flash is available for the browser
4. Apps2SD works again as an option for storing applications on the SD card

Until then, I'm back on CM 5.0.8 and happier than I could have imagined.