The CU80 v2 ISO is the PCB for round 2 of the CU80 TKL keyboard, with fixed layout ISO and VIA support.
To place the keyboard into bootloader mode in order to flash it, hold the ESC key while plugging the board in, or use the reset button on the back of the PCB.
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).