# Can reflash Klipper in MCU? **URL:** \ **Category:** General Discussion\ **Created:** [December 4, 2024, 10:38am UTC](https://klipper.discourse.group/t/can-reflash-klipper-in-mcu/20447 "2024-12-04T10:38:16Z")\ **Posts on this page:** 12\ **Page:** 1
**Author:** ![Peurif](https://avatars.discourse-cdn.com/v4/letter/p/c57346/32.png) [@Peurif](https://klipper.discourse.group/u/Peurif)\ **Post date:** [December 4, 2024, 10:38am UTC](https://klipper.discourse.group/t/can-reflash-klipper-in-mcu/20447/1 "2024-12-04T10:38:16Z")
### Basic Information: Printer Model: Vcore 3 MCU / Printerboard: Octopus Pror Host / SBC rpi4 klippy.log its strange > {“error”: {“code”: 404, “message”: “Not Found”, “traceback”: “Traceback (most recent call last):\n\n File "/home/pi/moonraker-env/lib/python3.11/site-packages/tornado/web.py", line 1790, in \_execute\n result = await result\n ^^^^^^^^^^^^\n\n File "/home/pi/moonraker/moonraker/components/application.py", line 795, in get\n self.absolute\_path = self.validate\_absolute\_path(\n ^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n\n File "/home/pi/moonraker-env/lib/python3.11/site-packages/tornado/web.py", line 2900, in validate\_absolute\_path\n raise HTTPError(404)\n\ntornado.web.HTTPError: HTTP 404: Not Found\n”}} _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_ _ **Be sure to check our “Knowledge Base” Category first. Most relevant items, e.g. error messages, are covered there** _ ### Describe your issue: Hi, I was updating Klipper on the MCU and when I thought it was finished I rebooted… but I think it was NOT finished. I use Fluidd, and it doesn’t access the MCU… I tried to log in to rpi and send a LSUSB, and the MCU is listed… When I try to record the LOG, to attach it to this message, it redirects me to a website where you can see the message I posted. What options do I have? How can I know if it’s fried? Can I flash Klipper again with an SD card? Is there another option? thx in advance … ---
**Author:** ![Sineos](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/sineos/32/18_2.png) [@Sineos](https://klipper.discourse.group/u/Sineos)\ **Post date:** [December 4, 2024, 2:43pm UTC](https://klipper.discourse.group/t/can-reflash-klipper-in-mcu/20447/2 "2024-12-04T14:43:13Z")
I really have a hard time to follow this description and understand your issue. Please check [How-To Ask for Help](https://klipper.discourse.group/t/how-to-ask-for-help/6327). Here are various methods listed to access the relevant log files. ---
**Author:** ![Peurif](https://avatars.discourse-cdn.com/v4/letter/p/c57346/32.png) [@Peurif](https://klipper.discourse.group/u/Peurif)\ **Post date:** [December 4, 2024, 6:27pm UTC](https://klipper.discourse.group/t/can-reflash-klipper-in-mcu/20447/3 "2024-12-04T18:27:30Z")
Sorry, my English is not very good, I use Google Translator… I’ll try to rephrase the question. First of all, I don’t attach any Klippy.log, because I can’t download it, when I try I get the message in Fluidd that I posted above… ```auto { "error": { "code": 404, "message": "Not Found", "traceback": "Traceback (most recent call last):\n\n File \"/home/pi/moonraker-env/lib/python3.11/site-packages/tornado/web.py\", line 1790, in _execute\n result = await result\n ^^^^^^^^^^^^\n\n File \"/home/pi/moonraker/moonraker/components/application.py\", line 795, in get\n self.absolute_path = self.validate_absolute_path(\n ^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n\n File \"/home/pi/moonraker-env/lib/python3.11/site-packages/tornado/web.py\", line 2900, in validate_absolute_path\n raise HTTPError(404)\n\ntornado.web.HTTPError: HTTP 404: Not Found\n" } } ``` The problem occurred this morning, I looked at the Fluidd updates section and it said there was one for Klipper and for something else… I don’t remember. In general, when there are updates for Klipper I apply them. Well, when I thought I had finished the installation, I restarted the printer (but I think I had NOT finished)… When the restart process finished, I accessed Fluidd through the WEB portal and I get the message that it can’t access Klipper. ![image](https://global.discourse-cdn.com/free1/uploads/klipper/original/3X/f/3/f399418058d5c489d8554221cc80b04c6ff79726.png) After several restarts, I decided to check if rPi “saw” the MCU. So I connected to rPi with Putty and sent the command “lsusb”, with this result: ![image](https://global.discourse-cdn.com/free1/uploads/klipper/original/3X/9/3/9382ef3f03fe7cae20cb719b5444ffc845065b5b.jpeg) I checked that the Octopus board ID had NOT changed, and that I had it correctly in the rPi CONFIGURATION ![image](https://global.discourse-cdn.com/free1/uploads/klipper/original/3X/d/e/de1c890e8c45c457a61ca851f80f2cd7cf5eb926.png) and my config in fluidd ![image](https://global.discourse-cdn.com/free1/uploads/klipper/original/3X/3/c/3ce3313beef2a3ed583d2190ead50393062f6628.png) After trying a couple more things without success, I tried to reflash Klipper on the MCU, using the method I originally used, using the SD. But after doing the procedure, the result is the same. Fluidd does NOT connect to the MCU (Octopus Pro) I was asking what I can do to reestablish communication between rPi and the MCU… or if on the contrary, by finishing the update early I had “fried” something… What can I try? ---
**Author:** ![hcet14](https://avatars.discourse-cdn.com/v4/letter/h/ecd19e/32.png) [@hcet14](https://klipper.discourse.group/u/hcet14)\ **Post date:** [December 4, 2024, 7:21pm UTC](https://klipper.discourse.group/t/can-reflash-klipper-in-mcu/20447/4 "2024-12-04T19:21:35Z")
> [@Peurif](#): > > First of all, I don’t attach any Klippy.log, because I can’t download it, when I try I get the message in Fluidd that I posted above… You already used Putty to connect to your Rpi. You may use the search function here to search in which directory on your Rpi the “klippy.log” is stored ![image](https://global.discourse-cdn.com/free1/uploads/klipper/original/3X/2/7/27be188f5e07f2fb0ca86d529b854dfd2b745c62.png) or Klpper documentation [Debugging - Klipper documentation](https://www.klipper3d.org/Debugging.html#generating-load-graphs) Good luck, hcet14 ---
**Author:** ![Sineos](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/sineos/32/18_2.png) [@Sineos](https://klipper.discourse.group/u/Sineos)\ **Post date:** [December 5, 2024, 8:28am UTC](https://klipper.discourse.group/t/can-reflash-klipper-in-mcu/20447/5 "2024-12-05T08:28:29Z")
> [@Peurif](#): > > What can I try? 1. Disconnect the Octopus board 2. Reconnect the board 3. Follow [How-To Trouble-Shoot](https://klipper.discourse.group/t/how-to-trouble-shoot/6326#linux-dmesg-5) ---
**Author:** ![Peurif](https://avatars.discourse-cdn.com/v4/letter/p/c57346/32.png) [@Peurif](https://klipper.discourse.group/u/Peurif)\ **Post date:** [December 6, 2024, 7:32am UTC](https://klipper.discourse.group/t/can-reflash-klipper-in-mcu/20447/6 "2024-12-06T07:32:06Z")
i have find klippy.log [klippy.log](https://klipper.discourse.group/uploads/short-url/thFZ3N9VNzgnNyDaEunPo8yN4sS.log) (5.6 MB) ---
**Author:** ![Peurif](https://avatars.discourse-cdn.com/v4/letter/p/c57346/32.png) [@Peurif](https://klipper.discourse.group/u/Peurif)\ **Post date:** [December 6, 2024, 7:36am UTC](https://klipper.discourse.group/t/can-reflash-klipper-in-mcu/20447/7 "2024-12-06T07:36:52Z")
i have sended dmesg by console… but i cant interepretate. can someone help me? Thx [dmesg.txt](https://klipper.discourse.group/uploads/short-url/5f4UyJKgnfh9865Cjr4C2F2jBEE.txt) (36.7 KB) EDIT: Without knowing much…in dmesg appears listed Octopus… andin lsusb result does appear detected by rPi. ---
**Author:** ![Sineos](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/sineos/32/18_2.png) [@Sineos](https://klipper.discourse.group/u/Sineos)\ **Post date:** [December 6, 2024, 8:51am UTC](https://klipper.discourse.group/t/can-reflash-klipper-in-mcu/20447/8 "2024-12-06T08:51:47Z")
I’m not sure that I understand your report: - dmesg shows that the Octopus MCU is correctly enumerated - your latest klippy.log shows a correct Klipper start with connected Octopus MCU ---
**Author:** ![Peurif](https://avatars.discourse-cdn.com/v4/letter/p/c57346/32.png) [@Peurif](https://klipper.discourse.group/u/Peurif)\ **Post date:** [December 6, 2024, 10:11am UTC](https://klipper.discourse.group/t/can-reflash-klipper-in-mcu/20447/9 "2024-12-06T10:11:08Z")
my god… solved… i have use Kiauh, and Rollback Klipper… AND NOW WORKS… thanks, as ever for your help, and sorry for disturb ![image](https://global.discourse-cdn.com/free1/uploads/klipper/original/3X/1/9/19436c5557bce896f232f1fc9dc60bc10567d764.png) ---
**Author:** ![Peurif](https://avatars.discourse-cdn.com/v4/letter/p/c57346/32.png) [@Peurif](https://klipper.discourse.group/u/Peurif)\ **Post date:** [December 6, 2024, 10:14am UTC](https://klipper.discourse.group/t/can-reflash-klipper-in-mcu/20447/10 "2024-12-06T10:14:16Z")
versions after rollback… ![before update](https://global.discourse-cdn.com/free1/uploads/klipper/original/3X/9/8/98d4c678be77ca2a8e42759b0789f37ff371ccd8.png) now i am triying to rerun update… more info later… ---
**Author:** ![Peurif](https://avatars.discourse-cdn.com/v4/letter/p/c57346/32.png) [@Peurif](https://klipper.discourse.group/u/Peurif)\ **Post date:** [December 6, 2024, 10:17am UTC](https://klipper.discourse.group/t/can-reflash-klipper-in-mcu/20447/11 "2024-12-06T10:17:27Z")
eiii… after update… now works… ![image](https://global.discourse-cdn.com/free1/uploads/klipper/original/3X/5/8/58110724009175625136f1141358fa4a6504bf90.png) and screenshot working ![image](https://global.discourse-cdn.com/free1/uploads/klipper/original/3X/1/2/12eccd7559029bec631f04696cb22be14a4b7b4b.png) ---
**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/klipper/original/1X/64419bf2aac6639e6ef5cef200dcd456b0a01ac3.png) [@system](https://klipper.discourse.group/u/system)\ **Post date:** [January 5, 2025, 8:17pm UTC](https://klipper.discourse.group/t/can-reflash-klipper-in-mcu/20447/12 "2025-01-05T20:17:48Z")
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