Arduino UNO SMD edition (clone, I think), DFU mode

Hi all! Need help with my UNO - can't understand, how to enable DFU mode.
Sorry for my english...

I just need to upload new HEX, but I cant...

That Arduino doesn't have a 16u2 chip. Instead, it appears to have a CH340G chip. The CH340 cannot be updated.

Sad.... =( I just wanted to make a joystick, already found an *.ino and HEX for that =(

If you want a joystick, the Esplora, Leonardo, Teensy, Micro, or Pro Micro will be great. Basically, anything with native USB(such as a Due) will work.

I chosed UNO because I need 5 or more axis, and many buttons for my avia simulator. I think, that I need Mega, or real UNO, not clone.

Why not leonardo?

Or the Esplora, as I already said. But the Esplora has only its built-in I/O. Unless you want to use the TFT screen header.