I guess you could update it if not ?/
http://www.blurbusters.com/benq-releases-v2-firmware-for-xl2411z-xl2420z-xl2720z/
kinda makes me wonder about the quality of benq monitors anyway??
http://www.tomshardware.com/forum/id-3008028/decide-benq-vz2250-benq-gw2255hm.html
then here a guy stated tthis ? ''Every monitor that has shipped after march 2015 is guaranteed to have V4 firmware. Benq stated this themselves'
https://linustechtips.com/main/topic/413587-benq-xl2411z-firmware/
then theres this ''Unfortunately, BenQ does not keep the firmware download page up to date' and also said about the v4 thing like the guy above ? ''Currently (mid 2015), monitors are shipped with firmware version 4''
[also see the ''How to call up the service menu '' to pull up that info you asked for on finding the version number]
http://display-corner.epfl.ch/index.php/BenQ_XL2411Z
looks to me benq is a display maybe to avoid ??