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Hi everyone ! I got a Voron 2.4 controlled with a RP3 and an Octopus board. I want to upgrade it with a SB2040 from Mellow Fly, connected directly to the Octopus's canbus port. (Use a U2C or a canhat would be too easy). I followed the FDMTeam's tutorial : how-to-use-can-toolhead-boards-connected-directly-to-octopus-octopus-pro-on-canboot I also found that the CanBoot project seems compatible with the RP2040 mcu : Issue to integrate the RP2040 to the canboot And I also complete voids with the flash configuration recommended by Mellow Fly : SB2040 Flashing tutorial But at the moment, Klipper can't connect to the octopus and the SB2040 seems unflashed (the blue LED which mean "firmware's running" remains off). Sorry for the long post but, if it can help someone else, I have to detail everything. I did the following steps : Make a CanBoot bootloader for the Octopus Make a CanBoot bootloader for the SB2040 Flash the Octopus with STM32Cube Programmer and the CanBoot bootloader Flash the SB2040 from the Raspberry PI and the Canboot bootloader Make a Klipper bootloader for the Octopus Make a Klipper bootloader for the SB2040 Flash the Octopus with the Raspberry PI and the Klipper bootloader Flash the SB2040 throught the Octopus CanBus with the Klipper Bootloader Then I cried The can0 interface is still setup (ifconfig), I got my two can_uuid : [mcu] canbus_uuid: 3f56a5b6c36c ; [mcu SB2040] canbus_uuid: 2d70e57a001c But after I flashed the SB2040 through the canbus, his can_uuid disapeared. Of course, this probably comes from the fact that I can't use STM32Cube Programmer to make a "dual flash" ? I didn't truly understand the purpose of using STM32 Cube in that case. I replaced the [mcu] section of the printer.cfg file with : [mcu] canbus_uuid: 3f56a5b6c36c [mcu SB2040] canbus_uuid: 2d70e57a001c And the raspberry can't connect to the Octopus board. Klipper say : "mcu not available, try later". Not a surprise if Klipper is looking for the SB2040 mcu ! So, what did I miss ? Why after two flashs the SB2040 didn't have a firmware working ? Is there a software equivalent to STM32Cube to use with the RP2040 ? Thank you for your help. I know that the Canboot project is very young, and I'm looking for troubles, but I hope that it will also help other peoples who face the same problem.