jailbreak 3GS on 4.2.1 IOS, not possible now?

[dannyt]

The phone is currently on 4.2.1, never jailbroken already check with TU. I jailbroke it with redsnow but the installed cydia icon look white and it could not open. I know that I can downgrade to 4.1 and re-jailbreak but I wonder is there other way to keep 4.2.1 IOS.

[2k1]

Cydia icon white? Do redsnow again and boot tethered then the Cydia icon should appear the right color

[dannyt]

is it because 4.2.1 with redsnow a tethered jailbreak?

[iYeow]

Tethered with redsnow is fine , now run GreenPoison rc4 or 5 over this to get untethered jailbreak.

[karloz25]

Tethered with redsnow is fine , now run GreenPoison rc4 or 5 over this to get untethered jailbreak.

Ive never used Greenpoison, can u post the steps to UNtethere a JB on 4.2.1 Custom FW

Thanks!

Edit:
Never mind, I used Greenpois0n RC6.1 on my Tethered 4.2.1 3GS and in about 4mins, it worked perfect, NO MORE TETHERE!!!! (yayy)

Thanks!

I was planning on updating to 4.3.3 but this saved me the trouble! Thanks!

Greenpois0n.com
How To Use Greenpois0n – The Quick Guide

Remember greenpois0n is not and unlock it is a jailbreak (if you are unsure of the difference, stop now and become friends with google)
Download and extract greenpois0n from the .zip and start greenpois0n.
Attach your iPhone, iPad or iPod to your computer and click ‘Jailbreak’.
Greenpois0n will now commence its DFU guide, if you know how to put your device into ‘DFU Mode’ you can do this at your own speed and greenpois0n will acknowledge a successful DFU operation.
Press ‘Jailbreak’ and let greenpois0n do its thing, you will see wonderful lines of text scroll on your screen to assure you that something is happening.
After a few seconds greenpois0n will display a ‘complete’ message, the greenpois0n injection is complete and wait for your device to reboot automatically.
Once your device has rebooted make sure you have an active internet connection, locate and press the ‘Loader’ icon on your device, this will download cydia and install it for you, once it has done this your device needs to reboot one more time.
Your done! Enjoy