**Check your PCB before flashing!** Loading rev1 firmware on a rev2 PCB may result in a non-functional PCB which can only be recovered using a hardware programmer (e.g. an ST-Link V2)
* Hardware Availability: Group Buy took place between 2021-05-22 1600 UTC and 2021-05-25 1600 UTC on [https://jackylab.com/](https://jackylab.com/). Rev 2 PCBs were provided during extras sales and as replacements.
See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
* **Bootmagic reset**: Hold down the top left key and plug in the keyboard. This will also clear EEPROM/emulated EEPROM, so it is a good first step if the keyboard is misbehaving.
* **Physical reset**:
- Rev 1: Short the set of vertical holes on the third row, to the right of Caps Lock. These can be reached with tweezers after the board has been assembled.
- Rev 2: Near the MCU there are two square pads with a circle in the middle. This is an unpopulated footprint for a reset button. Short these two pads twice in quick succession.
After entering the bootloader through one of the three methods above:
- Rev 1: The keyboard will appear as an Atmel DFU device. It can be flashed using the QMK CLI or QMK Toolbox.
- Rev 2: The keyboard will appear as a USB mass storage device named `MT.KEY`. If the CLI is unable to find this device, the compiled `.uf2` file can be manually copied to it. The keyboard will reboot on completion with the new firmware loaded.
