Update went without a hitch. Problem is AFTER update, now my much loved (100% stock) Mesmerize is no longer reliable. I have sporatic loss of internet access until power-cycled. I see the roaming indicator sporatically while nicely couched. The built in mail application only sporatically works with Hotmail, now. The built-in browser locks up the phone on certain web pages, leaves the screen in a strange state, power button is not recognized, and requires pulling the battery. The built-in clock application, when using the Timer function, will drain the battery in about 4 hours; shuts down. The power button sporatically is frozen-out. Can only turn off display or power-down the unit by pulling the battery. So, please, how about instructions for reverting back to Eclair so I get a GOOD phone back? Update was via Kies to v2.2.1. A Thanks to Zebulon, will get in the (always deep) queue at USCC.