How to keep the files during the firmware upgrade in WB45?

To keep the files during the firmware upgrade in WB45, you will need to add the list followed by "# transfer-list:" in fw.txt in the release package. For example, to keep the certificates that are under /etc/ssl/certs during firmware upgrade, you need to add the following string in fw.txt in the release package. # transfer-list: /etc/ssl/certs