Only remove IOS249 if you are 3.2 firmware or lower. If you ignore this, you need to downgrade.
Delete IOS249 with AnyTitleDeleter and then run the cIOS installer to install the new one. The black screen might be a sign of a error on your sd card, let your pc check it. As said before cIOS37 as IOS249 will mess up things, i'm sure you don't want this. Use the d-pad to select something in the installer.
Delete IOS249 with AnyTitleDeleter and then run the cIOS installer to install the new one. The black screen might be a sign of a error on your sd card, let your pc check it. As said before cIOS37 as IOS249 will mess up things, i'm sure you don't want this. Use the d-pad to select something in the installer.