# CB1 Version error **URL:** \ **Category:** General Discussion\ **Created:** [February 3, 2024, 12:44pm UTC](https://klipper.discourse.group/t/cb1-version-error/13781 "2024-02-03T12:44:19Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Djripper666](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/djripper666/32/8551_2.png) [@Djripper666](https://klipper.discourse.group/u/Djripper666)\ **Post date:** [February 3, 2024, 12:44pm UTC](https://klipper.discourse.group/t/cb1-version-error/13781/1 "2024-02-03T12:44:19Z")
### Basic Information: Printer Model: MCU / Printerboard: `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_ _ **Be sure to check our “Knowledge Base” Category first. Most relevant items, e.g. error messages, are covered there** _ ### Describe your issue: [klippy(2).log](https://klipper.discourse.group/uploads/short-url/tR7gy2zeeP3Mb6JkrvhV6PnBiAO.log) (383.2 KB) Hello peeps, I have just updated mainsail by just clicking update all. Now I have re flashed the SKR 3 EZ board after the update, however I am getting the error. Klipper reports: ERROR MCU Protocol error This is frequently caused by running an older version of the firmware on the MCU(s). Fix by recompiling and flashing the firmware. Your Klipper version is: v0.12.0-102-g9f41f53c MCU(s) which should be updated: CB1: Current version v0.11.0-241-gffb5105b Up-to-date MCU(s): mcu: Current version v0.12.0-102-g9f41f53c Once the underlying issue is corrected, use the “RESTART” command to reload the config and restart the host software. mcu ‘CB1’: Command format mismatch: query\_adxl345 oid=%c rest\_ticks=%u vs query\_adxl345 oid=%c clock=%u rest\_ticks=%u Now I am not sure how else to fix the CB1 version? Please help and thank you in advance. … ---
**Author:** ![Djripper666](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/djripper666/32/8551_2.png) [@Djripper666](https://klipper.discourse.group/u/Djripper666)\ **Post date:** [February 3, 2024, 12:47pm UTC](https://klipper.discourse.group/t/cb1-version-error/13781/2 "2024-02-03T12:47:19Z")
Sorry I should add it’s a BTT Pad7 with SKR 3 EZ connected using USB. Another question is can I flash firmware to the SKR 3 using usb connected to the pad if I use the KIAUH? ---
**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:** [February 3, 2024, 4:59pm UTC](https://klipper.discourse.group/t/cb1-version-error/13781/3 "2024-02-03T16:59:03Z")
See [MCU Protocol error caused by running an older version of the firmware](https://klipper.discourse.group/t/mcu-protocol-error-caused-by-running-an-older-version-of-the-firmware/10371) You need to update your host MCU. ---
**Author:** ![Djripper666](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/djripper666/32/8551_2.png) [@Djripper666](https://klipper.discourse.group/u/Djripper666)\ **Post date:** [February 3, 2024, 8:56pm UTC](https://klipper.discourse.group/t/cb1-version-error/13781/4 "2024-02-03T20:56:23Z")
I gathered that i would but not sure how outside of clicking update in mainsail. I have already updated the SKR board using make and putting on an sdcard then flashing that way and by the looks of it unless I’m reading it wrong then the SKR has been updated. Just can’t work out how to get the BTT Pad 7 to update? Or just following this to a T [https://www.klipper3d.org/RPi\_microcontroller.html](https://www.klipper3d.org/RPi_microcontroller.html) ---
**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:** [February 4, 2024, 9:56am UTC](https://klipper.discourse.group/t/cb1-version-error/13781/5 "2024-02-04T09:56:55Z")
> [@Sineos](#): > > You need to update your host MCU. From the link above: ![grafik](https://global.discourse-cdn.com/free1/uploads/klipper/original/2X/4/4df91dcc7814fe4a46f3e7bfbb859d77f996ea61.png) so 🤷 ---
**Author:** ![Djripper666](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/djripper666/32/8551_2.png) [@Djripper666](https://klipper.discourse.group/u/Djripper666)\ **Post date:** [February 4, 2024, 10:11am UTC](https://klipper.discourse.group/t/cb1-version-error/13781/6 "2024-02-04T10:11:30Z")
Thank you that fixed it. ---
**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/klipper/original/1X/64419bf2aac6639e6ef5cef200dcd456b0a01ac3.png) [@system](https://klipper.discourse.group/u/system)\ **Post date:** [March 5, 2024, 8:11pm UTC](https://klipper.discourse.group/t/cb1-version-error/13781/7 "2024-03-05T20:11:38Z")
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