Thanks for the tip! Finally got the R4 card working, turns out it was something to do with the microsd, so i swapped my 64gb one for a 8gb along with all the files and it works!
Been trying to get this R4 to work for a while now, not sure whats wrong with it.
The micro-sd I use is a PNY micro SD XC 64gb with the most-recent firmware from r4isdhc.com.
Need help with what I'm doing wrong.