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hai

Welcome to Android Forums!!
Unless you wanna root your device you must wait for your carrier to make it available... i think
 
Welcome to the Android Forums!

According to the following thread on XDA, Acer currently has no plans to upgrade the BeTouch E400 to Android 2.2.

Acer Betouch E400 - xda-developers

For this reason you'll probably need to find a custom ROM in order to get FroYo on your phone.
 
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