R4 wont start.

Whenever i turn on my DS lite with the R4 in all I get is a black screen saying loading... which is what i get whenever I load up the R4 but only for a brief second.This time however its says Loading.. and doesn't change. Is there some sort of software update I can download. Im on a Mac BTW so could some one explain were to put the downloaded software file?Cheers.

Copy all of your games and save files into your computer.... Then format your microSD card and re-download the kernel.... Heres the link....http://www.r4ds.com.cn/download/r4_v1.18_kernel.htmlAfter that put the microSD card back into your R4 and see if that fixes everything.... If it does then put your games and save files back in the microSD....