Saw your thread over on XDA as well.
So, here's the deal: if you get a "version error" using either the RUU or the Leak-V3 PB00IMG.ZIP (HBOOT method), then you need to first perform the fix-up which is documented in Jcase's thread on XDA:
HowTo: Flash Any Ruu - xda-developers
Note that there is a mistake in his instructions, use the correction below:
Code:
adb push flash_image /data/local/flash_image
adb push misc.img /data/local/misc.img
adb shell chmod 777 /data/local/flash_image
adb shell /data/local/flash_image misc [COLOR=green][B]/data/local/[/B][/COLOR]misc.img
Note that if you have previously tried using the RUU, then your PC already has the required USB drivers installed to be able to communicate with the phone using ADB; all you need to do is download the Android SDK and unpack/unzip it to have access to the "adb" program (in the "tools" folder of the SDK). You also need to have "USB debugging" turned on from the phone, and the USB cable plugged in.
After you have accomplished the above steps, the most sure-fire way to get back to stock is to use the HBOOT+PB00IMG.ZIP method using the Leak-V3 PB00IMG.ZIP file.
There is a reason why I am recommending this, and it is also the same reason why Jcase's post on XDA has a slightly misleading title: the method he put together allows
any PB00IMG.ZIP file to work with HBOOT, but not necessarily a RUU (.exe) utility. The reason for this is that the RUU utility relies on a specific version of the "reboot" program to place the phone into "oem-78" (or RUU) mode, and many dev roms do not have the correct "reboot" program to perform that action... so, getting "any RUU" to work means that you also would need to flash a dev ROM such as Ivanmmj's "Official" 1.0, or jcase's "Plain Jane" so that the correct "reboot" program is present.
Note that while I will guarantee that the above steps will produce the result you want (and immediately after booting up the Leak-V3 ROM, the phone will prompt you to install the July 2010 OTA), I did not provide you "spoon to mouth" instructions - you need to do an insignificant amount of searching and reading to find the correct files and read the right posts.
eu1