Have you read the instructions on how to downgrade to tether? Once you have WM5 on your phone you use the original Samsung PST Lite software and extract the YH25A image file (using something like WinRAR). If you load WinRAR, just open WinRAR and then tell it to open the exe file you download from Verizon. Once you do that they you will have the file, and can use the Samsung Software.

You don't need Activesync 4.1 to load the downgrade, but if you feel you really do need it, then a quick google search gave me this link:

http://www.download.com/ActiveSync/3...-10500222.html

It's still AS 4.1...

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-Michael
Need help setting up your i730/i830 or other WM2003/WM5 Phone, as well as the other hacks I have done, check out the MRailing Guides and Links