GR-55: Viewing the Current Version (GR-55)
Use the following steps to view the current version in the GR-55.
1. Press and hold the PAGE left and PAGE right buttons and turn on the power.
2. The GR-55’s current version number will be displayed next to “MAIN.”
3. When you're finished, turn off the power.
Caution: Never perform an update if the product is already up-to-date.