The curious thing is that the error occurs when Apple must authorize the update or restoration, and that is when iTunes gives the error. however, 3utools does get authorization from apple and updates without any problems. I think that in the next few weeks we will get an itunes update that solves this, or will make the necessary changes to the servers if that is where the problem is, but I don't think it will take until September as you indicate, because this beta of ios 16 is already is being signed, that means that with the release of the public beta they will have to have everything ready. In fact, if they are signing the second beta right now, I wouldn't be surprised if next week they launch it as the first public beta.