ive never had a reason to update the firmware on any dahua camera I have, but yeah.. there's no region locking bullshit like Hik, so if you can find a firmware for it you can apply it.
Dahua dont post firmware on the website, so your only hope would be someone else publishes it or your vendor is willing to acquire it on your behalf.. but everything works on this partictular camera, it has absolutely no issues that I've encountered.. so I highly doubt you'll ever have an excuse to update the firmware, unless you enjoy breaking working things just for the fun of it.
Dahua's firmware is a step above all others I've used, out of the box all the features are functional.. none of em are broken or implemented so poorly that a firmware update has ever been needed for me... the only people Ive ever seen have a good excuse to do an update was Dahua NVR's that were purchased before IVS/Smart Features started making there way into Cameras.. they had to update NVR firmware to work with the new IVS/Smart Features.
Ive 7 Dahua Cameras and a Dahua NVR, all are unique models.. no 2 cameras are the same.. pretty damn good track record if you ask me.