Cisco Catalyst 3850 Deployment Manual page 15

Confirm that the bundle is expanded and packages.conf file is present in the flash memory:
Reload the switch and boot with the newly created flash:packages.conf:
By default, when the software expand command is executed in the active switch of a switch stack, it is executed
on all switches in the stack.
To autoload the installed image, perform these steps:
Use the no boot manual command to disable manual boot:
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