DR-550, DR-550MKII: Checking the ROM Version April 11, 2023 06:22 Updated Follow The following procedure can be used to check the ROM version: 1. Power on while holding TEMPO and the >/+1 button. Related articles DR-550MKII: Technical Specifications DR-550mkII, DR-550: Synchronization System Updates When Using the New SRX Expansion Boards DR-5: Checking the ROM Version DR-550, DR-550MKII: Copying a Pattern