TUTORIAL - How to tether using Internet Sharing with new Official ROM!!
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Alright time to consolidate....
In order to get Internet Sharing working properly on the Sprint Touch after running the Official WM6.1 update you will need to do a bit of "tweaking".
You will need a registry editor in order to perform this tweak. I recommend PHM Registry Editor v0.70. It is freeware so you don't have to pay for it but you may use any registry editor of your choice. I personally use Resco Registry.
Using a registry editor, make the following changes:
HKLM\Comm\InternetSharing
Delete this string: Extension - isext.dll
HKLM\Comm\InternetSharing\Settings\ForceCellConnec tion
Change from "Phone As Modem" to "Sprint PCS" <<NO QUOTES
After you have made the above changes, wait THREE minutes(not really necessary to wait this long but just to be safe...) and then soft reset your phone.
After you have finished everything above, proceed to connect using Internet Sharing and enjoy!!
http://forum.ppcgeeks.com/showthread.php?t=30265