It is really simple to do if you follow this step by step tutorial:
STEP 1. Download the latest 64-bit Windows version of devilsclaw's Renesas flasher from http://sourceforge.net/projects/flasher/ and extract the files in a folder such as 'C:\Flasher'.
STEP 2. I assume you're on Windows 7 x64. Click on the Flasher folder once to select it (left click), then press the shift key and while still holding down the shift key do a right click and click on the Open Command Window Here menu item.
Your command window should now indicate c:\Flasher> as a working folder.
STEP 3. Dump the firmware. Type:
and hit enter.
That will tell you the drive ID number. Assuming that the drive ID is 1 then type:
flasher -d 1 -m main_firmware.bin
hit enter and wait until the dump completed message shows up. Then type:
flasher -d 1 -c core_firmware.bin
and again wait until it finishes.
That's it, and it is a completely danger-free operation.
PS. If the drive ID is a different number, just use that number instead of 1.