Based on service bulletin Krome-SB-001 (internal documentation) and visual board verification, the following are not possible without violating the warranty or damaging the unit:
Unlike older keyboards that relied solely on ROM chips, the Korg Krome (including the Krome EX) uses an internal solid-state storage device. This isn’t a standard SD card or USB drive you can see; it is a proprietary partition containing critical system files. korg krome inner storage imageimg file download verified
The most important file within this partition is the ImageIMG file. This is not a picture file. It is a binary disk image containing: Loss or corruption of the ImageIMG file = A bricked keyboard
Loss or corruption of the ImageIMG file = A bricked keyboard. If checksums don’t match, do not use the file