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Restoring Firmware after replacing MCU on Ultimaker 2.1.1 board

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I have just replaced the MCU chip on my Ultimaker 2.1.1 main board and am looking to reload firmware. Can someone provide guidance on installation of the boot loader and firmware? I am familiar with the ISCP interface and have an AVR but I need to know where to pick up the correct boot loader image that will allow me to use Cura to install the most recent firmware.


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