Flashing BTT Duo with Firmware on Ubuntu

**THIS IS A RISKY OPERATION YOU COULD EASILY BRICK YOUR BTT DUO **

It is really important that you update the firmware on your eddy before doing an installation, otherwise the serial config will be wrong.

Creating a Live USB Key

If you do not have a Raspberry PI or an Linux Desktop or Server machine, you can create a live USB and boot into that, the following instructions work fine on a Usb Key, just make sure the USB is at least 8GB in size to allow for installing the packages we need and cloning klipper.

https://ubuntu.com/tutorials/try-ubuntu-before-you-install#1-getting-started

Install some deps on Ubuntu

sudo apt-get install build-essential git libusb-1.0.0-dev pkg-config

Flashing

Connecting in BOOTSEL mode

You need to connect your btt eddy to your computer in BOOTSEL mode, you do this by disconnecting the eddy usb, and then push and hold boot button on Eddy (It's next to where the cable plugs in) and at the same time, plug in the cable to your computer.

You know its correct if you run an lsusb and see:

Flashing btteddy.uf2 file

First of all you need klipper:

git clone https://github.com/pellcorp/klipper.git

Then we need to build the rp2040_flash flasher:

cd klipper/lib/rp2040_flash
make
cd -

Note: If make fails you forgot to install build-essential package:

sudo apt-get install build-essential

Then try the make again

Then we need to do the actual flashing:

cd klipper
sudo python3 ./scripts/flash_usb.py -t rp2040 -d 2e8a:0003 fw/K1/btteddy.uf2

Note: We are not compiling new firmware, just flashing the firmware I have already prepared.