That is the ASICBoost FW from Bitmain. However, if you are not on the other listed firmware:
Antminer-R4-all-201704280718-autofreq-user-Update2UBI-NF.tar.gz
The update will not work. The update listed above changes the file system to UBI or something like that which is necessary for the AB firmware to be compatible as it uses a UBI filesystem but does not contain the necessary files to changeover the existing filesystem.
So if I have a stock R4, the steps would be to first install the Antminer-R4-all-201704280718-autofreq-user-Update2UBI-NF.tar.gz fw,
then the Antminer-R4-xilinx-201811121649-autofreq-user-UBI-NF.tar.gz fw. Is that correct?
This is exactly what i did to mine, which had a firmware from 2016. First to the Update2UBI one, then the latest. The fan of the R4 is ridiculously silent at 100% (mine does 3240rpm, some models only do 3000rpm) and in all its life has had the fourth wire disconnected, I don't think i ever saw the option to force fan speeds or chip freqs like i remember seeing in S9s so the fan have always been running at 100%, and the chips on autofreq (600ish).
After the update the hashrate went from 8 to 8.5, and the temperatures went down. Also it reports both PCB and Chip temperatures far better than the weird two values the 2016 firmware used to give...