Yes. You should be able to use a microSD card higher than 4GB.
However, keep in mind that Pixxi display only supports FAT16 which have a maximum of 4GB space. The rest of the unused space on the SD card can be accessed as RAW.
You will need to format the SD card appropriately using RMPET.
To use this tool:
- Open or create a new Workshop4 project
- Go to Tools menu and open RMPET
- Follow the instructions provided by the tool