--- title: How to Reset the Mainboard (Epsilon Series) description: If you have a mainboard with a wrong firmware for Epsilon, you will have to do a reset. For the launch of the BCN3D Epsilon, BCN3D has redesigned and improved the mainboard. --- [Skip to content](https://support.bcn3d.com/knowledge/reset-mainboard-epsilon-series#main-content) English Show submenu for translations [Contact support](https://support.bcn3d.com/knowledge/kb-tickets/new?hsLang=en) [Customer portal](https://support.bcn3d.com/repair-service?hsLang=en) ![knowledge-base-header-bcn3d-logo.png\]](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Header/knowledge-base-header-bcn3d-logo.png?height=40&name=knowledge-base-header-bcn3d-logo.png) - [Default HubSpot Blog](https://blog.bcn3d.com/) Open main navigation Close main navigation - [Default HubSpot Blog](https://blog.bcn3d.com/) - English Show submenu for translations - [Contact support](https://support.bcn3d.com/knowledge/kb-tickets/new) - [Customer portal](https://support.bcn3d.com/repair-service) - [BCN3D forum](https://www.bcn3d.com/community/) [BCN3D forum](https://www.bcn3d.com/community/) Hello. How can we help you? - There are no suggestions because the search field is empty. 1. [Knowledge base - BCN3D](https://support.bcn3d.com/knowledge?hsLang=en) 2. [Epsilon Series](https://support.bcn3d.com/knowledge/epsilon-series?hsLang=en) 3. [Troubleshooting](https://support.bcn3d.com/knowledge/epsilon-series?hsLang=en#troubleshooting) # How to Reset the Mainboard (Epsilon Series) ## If you have a mainboard with a wrong firmware for Epsilon, you will have to do a reset.   --- |   | [**EN**](https://support.bcn3d.com/knowledge/reset-mainboard-epsilon-series) | **ES** | | --- | --- | --- | ---   | **Tools** |   | | --- | --- | | ![allen-icon](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Tools/allen-icon.png?width=21&name=allen-icon.png) | > Allen Key 2.5mm | --- ### To reset the mainboard follow these steps:   | ![bcn3d-electrical-hazard-02](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Safety%20guide/bcn3d-electrical-hazard-02.png?width=70&name=bcn3d-electrical-hazard-02.png) |  **Attention!** **Electrical Hazard** **it's very important to** **turn off and disconnect the printer** to avoid short circuits or any risk of electrocution.  | | --- | --- | | **Do not touch the power supply or the power supply's terminals during this repair.** | | #### **1.** Turn off and disconnect the printer | ![bcn3d-epsilon-turn-off-1](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/General/bcn3d-epsilon-turn-off-1.png?width=387&name=bcn3d-epsilon-turn-off-1.png) | ![bcn3d-epsilon-turn-off-2](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/General/bcn3d-epsilon-turn-off-2.png?width=387&name=bcn3d-epsilon-turn-off-2.png) | | --- | --- | #### **2.** Remove the extruder motors cover in the back of the printer by loosening the two thumbscrews ![epsilon-extruder-motor-cover](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Epsilon/Remove%20inner%20cover/epsilon-extruder-motor-cover.png?width=688&name=epsilon-extruder-motor-cover.png) #### **3.** Remove the lower bowdens from the FRS ![epsilon-frs](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Epsilon/Remove%20inner%20cover/epsilon-frs.png?width=688&name=epsilon-frs.png) #### **4.** Remove the Z cable covers Follow the next article to understand the process: [How to remove the Z cable cover.](https://support.bcn3d.com/knowledge/remove-z-cable-cover-bcn3d-epsilon-series?hsLang=en) ![z-cable-cover](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Epsilon/Remove%20inner%20cover/z-cable-cover.png?width=600&name=z-cable-cover.png) #### **5. Raise the printing platform** To get access to the inner cover you will need to raise up the printer surface. If you can't turn on the printer, you will need to manually raise the printing platform by turning the Z motor lead screw. ![epsilon-lead-screw](https://support.bcn3d.com/hs-fs/hubfs/epsilon-lead-screw.jpg?width=688&name=epsilon-lead-screw.jpg) #### **6.** Remove the inner cover. Follow this guide to know how to do it: [How to remove the inner cover](https://support.bcn3d.com/knowledge/remove-inner-cover-bcn3d-epsilon-series?hsLang=en) ![inner-cover-1](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Epsilon/Remove%20inner%20cover/inner-cover-1.png?width=600&name=inner-cover-1.png) #### **7.** Once you have access to the mainboard, disconnect the 24V connector. ![24-cable-1](https://support.bcn3d.com/hs-fs/hubfs/24-cable-1.jpg?width=688&name=24-cable-1.jpg) #### **8.** Make sure the 24V cable is unplugged, then press the reset button while turning on the printer. Keep pressing until the message "flashing firmware" appears on the LCD ![mainboard](https://support.bcn3d.com/hs-fs/hubfs/mainboard.jpg?width=400&height=669&name=mainboard.jpg) #### **9. ** Once it is finished, turn off the machine and re-connect the 24V cable   | **Send us your comments about this article** | [![feedback-button](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Button/feedback-button.png?width=179&name=feedback-button.png)](https://share.hsforms.com/1F7t1sBuOQyWlAeRwwFSjgQ3fec5) | | --- | --- | |   **RELATED ARTICLES** | | | [![check mainboard fuse eng](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Related%20Articles%20English/check%20mainboard%20fuse%20eng.png?width=335&name=check%20mainboard%20fuse%20eng.png)](https://support.bcn3d.com/knowledge/mainboards-fuse-bcn3d-epsilon-series?hsLang=en) | [![update firmware sigma eng](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Related%20Articles%20English/update%20firmware%20sigma%20eng.png?width=336&name=update%20firmware%20sigma%20eng.png)](https://support.bcn3d.com/en/knowledge/update-firmware-bcn3d?hsLang=en) |     - 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