Requires firmware 4.2 or higher
This application can solve these two issues:
1.When you use custom keyboards, such as "5Row Keyboard iOS4" in iOS 4.2+ , your Settings.app may crash after you change keyboard settings. To fix this issue, just use this app and disable keyboard cache.
2.If you use some custom keyboards like "iClick Thai", it cannot work in iOS 4.2 in default. However, after you disable cache by this app, it can work forcibly in iOS 4.2+ .
This will add a new icon to your home screen.
See More Info below for a Screenshot