Insert your micro-SD card into your computer.
To use the korgkromeinnerstorageimage.img file, you cannot simply copy it to a card. You must "burn" or "write" the image to a micro-SD card (typically 4GB or larger).
Ensure you are downloading the image for the original Krome, not the Krome EX, as the internal data structures differ. Troubleshooting a Failed Restore
Most downloads come as a compressed .zip or .7z file. You must extract the actual .img file before trying to flash it.
Everything You Need to Know About the korgkromeinnerstorageimage.img File
Large .img files often break during download; always check the file size after completion.