--- description: ODYSSEY-FAQ title: Arduino IDE doesn't recognize the onboard microcontroller on ODYSSEY - X86J4105/ X86J4125 #keywords: slug: /not_recognize-onboard-microcontroller image: https://files.seeedstudio.com/wiki/wiki-platform/S.png last_update: date: 6/26/2023 author: Seraphina --- If your Arduino IDE doesn't recognize the onboard microcontroller on ODYSSEY - X86J4105/ X86J4125, please add a jumper wire between **RST Pin** and **GND Pin** on the 4-Pin header (to the left of SAMD21's 28 pins) to reset the AMSAMDG21. ![](https://files.seeedstudio.com/wiki/ODYSSEY-X86J4105/oydsseyx86J4105_pinout1.png)