ios5 crashed, fail to reboot

I'm using iPhone 4 with iOS 5 jb tethered.

I saw there are available updates on Cydia (one is called ios5 xxx, another one is androidlockXT). I simply clicked install updates though I didnt pay much attention on what the update content are. But there are error messages during updates, then it asked me to restart springboard.

After that a black screen appears with the loading icon in the middle (see attached). The icon spins once then stopped, after a while it spins once again then stopped. It still continues...

I tried to use redsn0w (0.9.9b6) "just boot" but after the pineapple it comes back to the same black screen with the icon. I tried to connect with iTunes but failed, unless I switched the phone to restore mode then on iTunes it appears with a restore option.

Appreciate if you could help. Many thanks.