Firmware update for the v2 model
This update brings fixes, improvements and some new channels. It is only for the v2 model because it is mainly related to MIDI support and SD card, which the v1 does not have. The new functionality will be demoed in near future. Many thanks to all who submitted bug reports or emailed me their suggestions!
You need a micro-SD card. There are two variants of v2 model, the SD card slot is "flipped" in the newer one - your printed manual shows the correct orientation. Also, in the wooden boxed model, or older DIY kits that don't necessarily have the wooden box but are enclosed in the PCB case (as opposed to plastic shell or acrylic sandwich) it may be hard to remove the SD card as the slot is quite deep, check out this simple trick. Only 32GB cards or smaller have been proved to work (they need to use SDHC format, not SDXC). A discussion relevant to SD cards and updating is going on here, feel free to ask questions if needed.
To avoid damage, please always power the unit OFF while inserting or removing the card. After you put the SD card in Gecho and power it on at least once, there will be file "update.htm" created on the card. Open it in your browser and follow the instructions displayed on screen. It is very simple, just download both files (firmware and config) and run the channel #44112233 (key in these numbers and press SET).