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#Drivers Geonaute Keymaze 300 Software upgrade

By switching the watch on while pressing ledt and right buttons.

There is an option in the menu of the original firmware.

#Drivers Geonaute Keymaze 300 Software upgrade

The watch can be taken into its "firmware upgrade mode" by two different means : Upgrade process firmware upgrade mode of the watch

Software : By disassembling the original firmware and bootloader.

Mainly on another watch ("W Kalenji 300 gps") which has the same pcb.

Hardware : by studying the pcb of the watch to find out the connections between the microcontroller and the various peripheral.

The information needed for this project were gathered by reverse engineering the watch in two different ways : Rather than having to open it in order to program it by JTAG, it would be much more convenient to use the built-in firmware upgrade mechanism of the watch. The GPS wristwatch "CW Kalenji 700 gps", is very similar to the "Keymaze 700 trail", it has the same microcontroller and thus can be easily reprogrammed.

For that, I had to upload a custom firmware in the STM32F103 microcontroller through JTAG (with a buspirate and OpenOCD). A while ago, I built a reverse geocache box from a broken GPS wristwatch ( Keymaze 700 trail) found in an electronics recycle bin.