ftp://ftp2.dlink.com/PRODUCTS/DSR-250/REVA/DSR-250_REVA_FIRMWARE_v3.12_WW.zip includes separate files for "intermediate" and "common" FW updates
The release notes say, Select the corresponding intermediate and common firmware version for upgrade process.
Does the "AND" in the sentence mean I have to first install the intermediate update or can I just go with uploading the common FW right on? There are different intermediate versions for different hardware revisions, but just one "common".
In other words, what does "intermediate" really mean here?