Hackinformer Forum

The format of Micro SD card of Sky3ds+ is FAT 32, which means the single file storage requirement is no exceeding than 4GB, but how to play the 3DS games over 4GB by Sky3ds+?

You could find the answer here:
Main Features:
* Included all the features of Sky3DS;
* Switch game back and forth by two orange buttons;
* More easier to use, copy and play, no diskWriter required;
* Compatible with other 3rd party homebrews;
* AP checks solved;
* Firmware updatable.
* Plug & Play, easy to use, Multi-rom support.
* Support all New3DS/3DSLL, 3DS/XL, 2DS consoles(US,EU,JP,KR,AU...).
*Support online game and eShop access.

*Compatible with any MicroSD 2GB,4GB,8GB,16GB,32GB,64GB,128GB SDHC/SDXC card.
http://sky3dsplus-flashcard.blogspot.com/

For rom file over 4GB, you need to trim the rom. And then play it with sky3ds+ orange button. I have find a tutorial on how to deal with it: https://youtu.be/2kGlvRSkyrU

You need to download the tool in the sky3ds official websites to tirm to less than 4g ,then could be use it !
for the sky3ds+ only.