Honeywell CIU 888 Firmware Upgrade Manual page 17

FIGURE 1-14
Part No.: 4417596_Rev11
Firmware Upgrades
Insert the key for unlocking in the key switch, and turn the key

clockwise.
Remove the key from the key switch and store it.

On the CIU 888 display, the status of the key switches changes from
'Locked' to 'Unlocked' (see FIGURE 1-4).
CIU 888 display: Configuration settings are unlocked
Firmware Upgrade Manual
CIU 888 1 - 11