I have a iPhone 3GS 3.0.1 jailbreaked with redsn0w 8.0. I reset all my settings and it went in too recovery mode loop. I then tried to jailbreak it with redsnow using 3.0 but it went back in recovery mode loop. What can I do to get it to work again ??

Use pwnagetool 3.1.3 to create a custom firmware and restore to a jailbroken 3.1. This is your ONLY option as of right now.

I jailbreaked my new T-mobile iPhone 3Gs 3.1.2 using BlackraIn. Now I am always stuck in recovery-mode (cable - itunes logo) AFTER rebooting (or just on - off)
I fix it every time it by using Blackra!n again.

I tried the program:Ireb but that doesn't fix the problem permanently.

There is a option using terminal on the Mac thats called iRecovery, but I don't understand how to do that.

Can anyone help me?

Thanks

This is a known issue has been discussed extensively. You have an iPhone 3GS manufactured after September. these iPhones have an updated bootrom that is no longer vulnerable to the 24kpwn hole which allowed previous 3GS and iPhone Touch 2G devices to remain jailbroken after a restart.

The solution is to re-run blackra1n each time you restart your iPhone, it uses a another hole to kick-start the boot process past the recovery mode and allow the iPhone to start up jailbroken. Also do not update to a newer OS release past 3.1.2 (when it is released) as this will prevent the blackra1n workaround from functioning and will permanently break your existing unlock.

If this can be fixed it requires a new bootrom exploit/hole. This could take months to find such a hole if one exists.

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iPhone 3GS 32GB factory unlocked (3.1; Pwnagetool, Cydia, OpenSSH)
iPhone 8GB (3.1.2; Pwnagetool, Cydia, OpenSSH)

Many thanks! I'll wait hopefully.