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I am trying to achieve the exact same thing as the OP, but even with the provided bootloader, am unable to get the board show up as a USB device. Burning the bootloader using Arduino IDE works and after the process has completed, the LED_BUILTIN starts to blink, which afaik should indicate that the bootloader is running. Any ideas what might be the issue? Any tips on how to debug this?Here is the entry from boards.txt I'm using:micro_int.name=Standalone Micromicro_int.vid.0=0x03ebmicro_int.pid.0=0x204amicro_int.upload.tool=avrdudemicro_int.upload.protocol=avr109micro_int.upload.maximum_size=28672micro_int.upload.maximum_data_size=2560micro_int.upload.speed=57600micro_int.upload.disable_flushing=truemicro_int.upload.use_1200bps_touch=truemicro_int.upload.wait_for_upload_port=truemicro_int.bootloader.tool=avrdudemicro_int.bootloader.low_fuses=0xe2micro_int.bootloader.high_fuses=0xd8micro_int.bootloader.extended_fuses=0xfbmicro_int.bootloader.file=caterina-internal/Caterina-eevblog2.hexmicro_int.bootloader.unlock_bits=0x3Fmicro_int.bootloader.lock_bits=0x2Fmicro_int.build.mcu=atmega32u4micro_int.build.f_cpu=8000000Lmicro_int.build.vid=0x03ebmicro_int.build.pid=0x204amicro_int.build.usb_product="Standalone Micro"micro_int.build.board=AVR_LILYPAD_USBmicro_int.build.core=arduinomicro_int.build.variant=leonardomicro_int.build.extra_flags={build.usb_flags}