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Cirrus LT User Manual v2.3 - Chapter 7
If you are updating a unit that is connected via wireless, you won’t get as
much information back from the unit as you would if it were wired.
8.
During the upgrade, the Cirrus LT will display the message shown below
until it finishes upgrading.
This progress bar will only be displayed on the LCD of the device. If you
have the lid closed and external monitors connected to the unit you will
not be able to see the Firmware progress bar.
The unit will automatically reboot and then be ready for use again.