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"you can use the Arduino ISP example sketch and some jumper wires to re-upload the bootloader"In the arduino IDE there is an example sketch included that allows an Arduino to act as an ISP programmer. There are numerous guides around but this one should be all you need:https://www.arduino.cc/en/Tutorial/ArduinoISP
I actually used an AVRISP-MKII that I had handy to reupload it, but thought I would include suggestions for an arduino Uno because they've sent so many of them in previous boxes.
I just thought I would make a quick comment here about something I encountered with the Beetle that may catch newer users off guard. The arduino leonardo differs from some other more common arduino boards because the USB communication, bootloader and sketch are all together on one chip, so buggy code can actually prevent the beetle from communicating through usb at all! If you upload a sketch and your beetle locks up don't panic! If you have another arduino laying around you can use the Arduino ISP example sketch and some jumper wires to re-upload the bootloader to the beetle and get it back up and running!For an Uno the pinout is as follows:UNO | BeetlePIN 10 >> RESPIN 11 >> MOPIN 12 >> MIPIN 13 >> SCKPIN 5V >> 5V GND >> GND