The new firmware can easily be downloaded from their website (
http://www.ruizu.com.cn/).
Let Google Translate translate the page (use Chrome, Install the plugin).
You have to download a tool and the firmware (20170805) itself.
The tool can be installed like this : take the files MSIEN.MSI and MSI.CAB from the unpacked folder and put them in the root one of your drives.
Doubleclick MSIEN.MSI.
In installs the English version of the tool which also has an English helpfile.
The firmware package contains two sets of .HEX and .FW files. One has -I- in it's name so I reckon that's the international version.
When you start the program it asks you to select an .FW file.
That is where it ended for me since the program didn't see my device and when selecting one of the firmware files it said they were corrupted.
The download went without problems and the .zip file unpacked without error so the files are not corrupt (or they are corrupt on the Ruizu site).
As last attempt I put both files on an empty SD card and tried the upgrade option on the device but that didn't find any files and offers no choice to select anything.
I'm happy with the device as it is, and to be honest, I don't expect any fixes or support on it. If you want that you need to buy a Shanling, or Cayin player (which I have both too).