That's how the situation was described by our forum member
Anathema(I corresponded with ICQ, and I did not receive permission to quote, however, like a rejection, but
if the author wishes, I can remove this message )
Anathema [savagemessiahzine.com] (20:42:06 3/06/2009)
Even when there was a beta tuna 8.2, even then it was not possible to make a jail 3.0 beta with it. Then I began to put the iTunesMobileDevice.dll file from tuna 8.1 into the archive with QuickPwn and everything worked. Anyone who installed 5 beta 3.0 and made a jail already knows that some file managers have stopped working, and some not all folders begin to see. Now the release just came out and someone spread the rumor. In fact, everything is much simpler - Apple changed the exchange protocol in the new tuna not with the goal of banning jail, but with the goal of optimizing and / or adding new features, and it so happened that many old programs stopped working. This is normal and will be corrected with the release of new versions of these programs.
P.S. I set 8.2 and synchronized the phone (2.2.1, the jail was done on tuna 8.1). Everything works fine, even "all that is needed" is set as it was!
Save iTunesMobileDevice.dll from tuna 8.1 just in case. Then it can be enclosed, for example, in the unpacked QuickPwn for jail. This information has not yet been verified, if anyone wants to experiment, then write about the results.
If someone helped this way of gratitudeAnathema