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I was upgrading a Catalyst 3850 48 port switch from version 03.07.01E to version 16.12.07. I’ve done this upgrade quite a few times. Followed the Cisco upgrade procedures that you find online when you download your software file. I always have them open, or the command needed to start the upgrade process. Console access showed me that my switch after my reload ended up in ROMMON mode.

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IOS XE supported switches such as the 3850 and 3650 support two modes, Bundle mode and Install mode.   New switches, by default, are shipped with install mode.   If you never paid attention during an IOS XE upgrade on a switch you may have just copy the IOS XE image to flash and set the system boot variable to boot from the new IOS using the command below:

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