iPhone 3GS and iPhone 3G owners stuck on baseband 6.15.00 now will be able to downgrade their baseband to previous bb version iPhone dev team just announced today: http://www.jailbreakwizz.com/2012/06/downgrade-iphone-3gs3g-baseband-61500.html what do you think guyz?
As far as my knowledge for needs of downgrade their baseband to iPhone's firmware bacause it is the only way to restore the use of your iPhone's full functionality is usually to downgrade to the original version of iPhone firmware easily in one step.
Hi brother 6.15.00 base band is unlockable for 3g and3gs both than why we have to downgrade it in my knowledge base band is the key factor of unlocking iphone.