The SLX-OS software (firmware) download is performed incrementally, unless otherwise specified. The firmware download command compares the new software packages against the current installation and only downloads the packages that contain new features or have been modified.
If a software download session is interrupted by an unexpected reboot, SLX-OS attempts to recover the previously installed software. Success depends on the state of the software download. You must wait for the recovery to complete before starting another software download.
Important
Before upgrading or downgrading the device's firmware, it is recommended that you execute the copy running-config startup-config command. This will ensure that the startup-config data store and the startup-config file are updated with the changes stored in the running-config data store.