I'm not sure but according to the and-732 it must be present:

CLIENT PROPERTIES FILE
The following FW properties are currently being taken from AIS for long form but should be moved to client properties:

    fwServer
    fwNetworkId
    fwProfile - this will dictate if ads are HLS or progressive (c4_android_hls_test & c4_android_hls_live)
    fwAdManagerLocation