Thanks! Recovered my MP4!
To recover follow your instructions, but I did something different, the first use RK27DM.exe program, which allowed me to be able to install the Rockusb driver, after doing so did not show any partition, it occurred to me to open the program RK27Upgrade_v2.5 and finally was recovered.
The only bad thing is that lost all multimedia files, but this is not really that important.
Thank you, I served much your help!
Greetings.