Load the BootLoader

The goal is to load the application and configuration through the gain connector without any hardware mods. For that you need to program the a ATmega8 with a BootLoader to be able to communicate by a single wire (the signal wire on the gain connector).
I´ve used the DL5NEG bootloader slightly modified for this purpose.

Download the bootloader code and the hex file.

To program the ATmega8 you need a programmer device like the AVRISP mkII or use the PonyProg and the PC parallel port with some extra hardware.
Open the gyro and connect the programmer to the SPI interface (VCC, GND, MOSI, MISO, RESET and SCK) . See the pcb pictures and use your iron solder carefully.
Once the bootloader is programmed set the fuse bits like this:


Now you can remove all the wires that you have soldered and close the gyro!