How know bootloader flashed?

[Peurif]

Basic Information:

Printer Model: Ratrig Vcore 3.1
MCU / Printerboard: octopus pro and ebb42
Host / SBC rpi4
klippy.log

Fill out above information and in all cases attach your klippy.log file (use zip to compress it, if too big). Pasting your printer.cfg is not needed
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Describe your issue:

Is there any way to know the bootloader that has a Canboard flashed? Maybe some command on the console
…

[Sineos]

If you configured Katapult according to relevant guides, you should be able to call the bootloader by quickly double-pressing the reset button.

Then use the command:

sudo dmesg

At the end, you should see something like:

Reset again and you should be back in Klipper.

As an alternative, you can call the bootloader (if correctly installed) with:

sudo service klipper stop
~/katapult/scripts/flashtool.py -r -d /dev/serial/by-id/<YOUR_SERIAL> # Replace <YOUR_SERIAL>
sudo dmesg
sudo service klipper start