Text OS is a small application designed to be of quick use to developers. The purpose of Text OS is to get developers to test their games faster on the DS Hardware.Text OS provide support to boot only Homebrew apps. It will also boot what ever is in slot-2 of the device.There is a R4 ready version in the “R4_ready” folder. This replaces the R4 interface.All you have to do is delete the old R4 files, backing them up of course and placeing the files from the folder on the root of your card.

Thanks to http://www.nintendomax.com for the news.