If you want jailbreak iPhone 3GS with firmware 3.0 using Redsn0w 0.8. Now you can do it by using simple steps guide but you firstly must have updated or restored to the original iPhone OS Firmware 3.0 on your iPhone 3GS using iTunes 8.2 before make any move, after ward you can follow all the steps from the following link:
http://www.redmondpie.com/how-to-jailbreak-iphone-3gs-with-redsn0w/
Originally from: How to Jailbreak iPhone 3GS with redsn0w
Good luck!
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[...] Step 3: Start redsn0w in order to jailbreaking your iPhone 3GS using redsn0w but firstly close iTunes. And follow the following steps to use redsn0w to jailbreak iPhone 3GS. [...]