This version of FW is very buggy.
I have several IPC-HDBW4231E-ASE + IPC-HDBW4231E-AS + IPC-HDBW4231F-AS, after the version 2.460.0000000.16.R, Build Date: 2017-09-04.
Bit rate so much CBR is not able to maintain the set value - it goes beyond the scale, resulting in a black image preview...