# Problem setting up CAN-Bus - no UUID after flashing klipper **URL:** \ **Category:** General Discussion\ **Created:** [January 14, 2024, 12:29pm UTC](https://klipper.discourse.group/t/problem-setting-up-can-bus-no-uuid-after-flashing-klipper/13151 "2024-01-14T12:29:38Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Piggels](https://avatars.discourse-cdn.com/v4/letter/p/3ec8ea/32.png) [@Piggels](https://klipper.discourse.group/u/Piggels)\ **Post date:** [January 14, 2024, 12:29pm UTC](https://klipper.discourse.group/t/problem-setting-up-can-bus-no-uuid-after-flashing-klipper/13151/1 "2024-01-14T12:29:38Z")
Printer Model: Voron 2.4 MCU / Printerboard: Octopus, U2C, SB2209 Hi, after several days this seems to be my last hope. The setup works perfeclty until flashing the SB2209. Katapult can be flashed onto the SB2209 and there is an UUID. Flashing Klipper also seems to work but after that, there is no longer any UUID available, and this is where I’m stuck. Expected was the UUID and Application: Klipper. Anyone any ideas? pi@mainsail:~ $ python3 ~/katapult/scripts/flashtool.py -i can0 -q Resetting all bootloader node IDs… Checking for Katapult nodes… Detected UUID: b07717dda10f, Application: Katapult Query Complete pi@mainsail:~ $ python3 ~/katapult/scripts/flashtool.py -i can0 -u b07717dda10f -f ~/klipper/out/klipper.bin Sending bootloader jump command… Resetting all bootloader node IDs… Attempting to connect to bootloader Katapult Connected Protocol Version: 1.0.0 Block Size: 64 bytes Application Start: 0x8002000 MCU type: stm32g0b1xx Verifying canbus connection Flashing ‘/home/pi/klipper/out/klipper.bin’… [##################################################] Write complete: 14 pages Verifying (block count = 444)… [##################################################] Verification Complete: SHA = 45576FC974FC4F9694A7F32515AC2D497817CA70 Flash Success pi@mainsail:~ $ python3 ~/katapult/scripts/flashtool.py -i can0 -q Resetting all bootloader node IDs… Checking for Katapult nodes… Query Complete ---
**Author:** ![Piggels](https://avatars.discourse-cdn.com/v4/letter/p/3ec8ea/32.png) [@Piggels](https://klipper.discourse.group/u/Piggels)\ **Post date:** [January 14, 2024, 10:01pm UTC](https://klipper.discourse.group/t/problem-setting-up-can-bus-no-uuid-after-flashing-klipper/13151/2 "2024-01-14T22:01:02Z")
The problem was solved by flashing klipper via USB in DFU-Mode. Any errors during the flashing don’t seem to be a problem. ---
**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/klipper/original/1X/64419bf2aac6639e6ef5cef200dcd456b0a01ac3.png) [@system](https://klipper.discourse.group/u/system)\ **Post date:** [February 14, 2024, 8:01am UTC](https://klipper.discourse.group/t/problem-setting-up-can-bus-no-uuid-after-flashing-klipper/13151/3 "2024-02-14T08:01:50Z")
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