9.4.1. Stored firmware backup feature
This option allows you to switch between the current and the previous firmware version. No internet or SD-card needed.
1. Go to Settings → Firmware → Stored backup firmware.
2. The following screen shows the firmware version currently running and the firmware version that can be booted.
3. Click on 'Press to boot' to boot into the stored firmware version.
4. The stored firmware version is now booted and the previous firmware version will be saved instead.
Color Control GX Manual
Page 52 Firmware updates