Re: DIY Build ISP Questions [Build your own upgrader dongle!
I just managed to flash the V2 firmware on my XL2411Z, using only a VGA cable and some code I wrote.
It only requires a PC or laptop running GNU/Linux, and a video chip that exposes its I2C bus (the Intel graphic chip icluded in most laptops and recent CPUs does).
It's all available here : http://boeglin.org/blog/index.php?entry ... -free(dom)
I'll clean it up a bit soon, but currently, you might have to modify one line to match your I2C device : line 73 of mstarddc_spi.c, the "/dev/i2c-1" device has to match the one corresponding to your VGA port (you get this info using "i2cdetect -l").
As always, use it at your own risk.