OK, we have a solution!

Make sure you understand what caused this problem:
iTunes 7.4.2 updates the mobiledevices.dll that Jailbreak uses, this causes private functions to misplaced. So if you want to jailbreak using iTunes 7.4.2 you *MUST* use an UPDATED version of INdependance 1.1.1 or AppTapp 3.0. Otherwise, your phone will go into an endless reboot loop.

Beside from that, there is no danger in using iTunes 7.4.2 none what so ever.

If you were unlucky enough to try old jailbreak with new iTunes 7.4.2, and got endless reboot loop here is what you to do solve it:

1.) Make sure you have iTunes 7.4.2 intalled
2.) Make sure you have AppTapp 3.0 installed
3.) Make sure you kill iTunes and iTuneshelper using acitivity monitor
4.) Put your iPhone into recovery restore mode (yellow triangel) by holdning down sleep and home button together for about 25 seconds.
5.) Now start AppTapp, but do not click anything
6.) Open Terminal, cd to the AppTapp application, into Contents/Resources/
7.) now type ./iphonecomm -s 4

That's it, you should be out of reboot loop, and you will be able to activate/jailbreaking using the AppTapp 3.0 application.

A big big THANKYOU to ender-iii from apptapp!! They have posted futher instructions at http://iphone.nullriver.com:16080/beta/


Good luck,
Vinjard/Hydr-

Thats it.
Case closed.
No more problems with iTunes 7.4

Congratulatons Vinjard!

Just to have all info in the same place:

If you have an OLD JAILBREAK iPhone and iTunes 7.4, and if you RESTORE, do not use OLD JAILBREAK or you will end with an inifity restart loop. Instead use iNdependence 1.1.1 or AppTapp

iNdependence: http://code.google.com/p/independence/

AppTapp: http://www.nullriver.com/~zigzag/AppTappInstaller.zip

I have a bricked iPhone.

I'm trying to install Apptapp 3.0. What version firmware do I select? I did the latest and I'm getting a message saying "AppTapp is now trying to install required files to your iPhone". Is it safe to dock the iPhone now?

Someone give this guy a medal.

WELL DONE.

Last login: Fri Sep 7 07:21:31 on console
Welcome to Darwin!
Mikes-Imac:~ mike$ cd AppTapp
-bash: cd: AppTapp: No such file or directory
Mikes-Imac:~ mike$ /Users/mike/Desktop/AppTapp\ Installer.app/Contents/Resources/iphonecomm -s 4
Starting at Stage 4
Architecture: i386

Stage 4: 0 Looking for iPhone...

awesome! gj! and thanks for all the hard work! i no longer fear 7.4 hehe =)

Same here. Nothing is happening...

Update: Since it was not doing anything, I opened activity monitor and quit the process iphonecomm. I then typed the command again in terminal and then it finally worked.

To vinjard, thank you very much. If ever you are in Manila, lemme know and I'll buy you a beer. Thanks again.



A

thanks a million!!!!!!!!!!!

./iphonecomm -s 4
Starting at Stage 4
Architecture: i386

Stage 4: 0 Looking for iPhone...
Bus error


Anyone get this? My iPhone is completely bricked...

i can confirm this also works for the endless kernel boot problem.
A huge thanks to the people of AppTap and the guys relaying the message. You spread relief around the world.