Installing the Russian HDP-r10/DX100 Firmware on your DX100
Here are the tools you need, the iBasso FW update tool (with instructions) and the update.img file (the Russian HDP-r10/DX100 FW). These instructions and tools are designed for a Windows machine (32 OR 64 bit, both drivers are included). Drivers listed are for Vista and Windows 7, unsure of the compatibility of latter versions.
https://www.mediafire.com/folder/u47a4njr6n4x7/DX100_Tools
DISCLAIMER
If you do this, it is entirely at your own risk, if you brick your device I cannot offer support to unbrick it. I've used this tool many times and it's always worked perfectly for my DX100, but you have been warned.
Method
-Ensure you either have a power supply connected to the DX100 or your battery is well charged.
-Download and unzip the tools to your WINDOWS machine.
-Remove your SD card and back-up anything in the DX100's built-in memory that you need to keep as this process will completely wipe it.
-Open the PDF file (DX100 firmware installation.pdf)
-Start at Step 2. Follow the instructions in the PDF. You are basically going to install a new driver for the DX100 (from the files provided) which will allow you to upload the new .img file using their tool. Their diagram is easy to follow.
-Once uploaded, the DX100 will perform the upgrade, be patient it takes a few mins.
Once it has finished you'll see lots of Russian language on the screen. To change to English, press the Settings icon, then Language and Keyboard which is 3rd from the bottom. Select the first item and browse to the Language of choice.
enjoy!