The E6-V2 is a 60% keyboard manufactured by Exclusive.
These docs are for the QMK version of the E6-V2 PCB. More info on qmk.fm
The E6V2 has been available with either a bootmapper client or QMK powered PCB. During the second round, the QMK powered PCB was redesigned and used different ports and a different switch matrix.
Please use the appropriate version when making your firmware. Flashing one in place of the other, can brick your PCB. Please be certain whether you have a OE or LE PCB.
See build environment setup then the make instructions for more information.