The iPhone Dev Team has released updated version of Redsnow jailbreaking tool which will now report whenever you selected .png extension image file is invalid when using custom tethered boot logo option. Mostly things are remain same in this update as compare to last update.
Follow our step by step guide for jailbreak iPhone, iPad or iPod touch on iOS 4.2.1 using Redsnow 0.9.7 Beta 4 click here, or if you want to jailbreak iOS 4 iPhone, iPad or iPod touch using Redsn0w 0.9.5 beta 4 click here
It is now available for Windows and Mac for download Redsn0w 0.9.6rc8 click on given links below.
for download Redsn0w 0.9.6rc8 for WINDOWS click here
for download Redsn0w 0.9.6rc8 for MAC click here