http://r4sdhc.com/down/R4/English-1.31.rar there's already a 1.32 out... If this is for HGSS, I can confirm that it doesn't work.
can i get the link for v1.31 for r4 microsd? (mine is probably fake, but it runs on v1.18 right now with ysmenu great)
There isn't a 1.31 for the original R4. You can install 1.24 from www.r4li.com (Doesn't solve HG/SS though).
1.31 and onward are only for the SDHC (which is a fake) the original r4's last official firmware was 1.18, but now there's ysmenu, etc.
For the R4 SDHC I have just downloaded v1.32 from http://www.r4sdhc.com/. For the original R4 my daughter uses v1.19, cannot remember where I got it and a quick search only pulled up a site in Chinese (i think). Hope this helps