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There is another way to install the firmware without overwriting configuration, that is to perform the manual upgrade to R81.10.x via CLI.

- Perform the following Expert Mode command in order to allow SCP protocol connection:

bashUser on

- Please download the latest GA version of firmware for the 1500 appliances:

- Enter the appliance via WinSCP connection of SCP protocol and upload to the /storage directory the latest GA version image.

Note: Before uploading image to /storage directory, all the files in this directory have to be deleted.

rm -rf /storage/* 

- Perform the following Expert Mode command for a manual upgrade via CLI:

upgrade_revert_image.sh /storage/%FILENAME% upgrade safe