r4i ultra skinning problem please help

i recieved my r4i ultra today and it works perfectly only problem is that when i put one of my downloaded themes on it comes up as a blurry mess of lines and static and also i am supossed to be able to switch through my themes by pushing select at the start screen but the select button does nothing there even with the 12 default themes i looked up my flashcard website and they say it should support r4ds themes natively but i cant get any to work please help me with this matter thankyou

https://www.romulation.org/forum/index.php?topic=7694.0 ?

thats what i did and it didnt work

That happened to me on my R4 ultra. Try saving your bitmap files with 16bit depth.

anyone know how to do that 16 bit depth save?