Software downgrade from 3.16.651.3 Hboot 2.09.0000

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http://androidforums.com – I was wondering if there's a way to downgrade my Evo 4G LTE's stock software version from 3.16.651.3 to an earlier version? I'm asking because it seems that I am STILL occasionally having problems with WiFi tether with this version, and I have to basically do a factory restore to get it to work again. I have read other people have been seeming to be having the exact same issue with tethering with this software version. If there's any way to downgrade to an earlier version, someone PLEASE let me know! This is driving me insane & I'm too young to be getting grey hair! I'm starting to look li (General)