My firmware does not seem to be working We currently are running grbl1.1e. If you want to reload your firmware you can follow the directions here:

Uploading Grbl 1.1e on the E3 and E CNC router.

Please make sure you follow each step.

Not erasing the EEPROM will cause the memory to become corrupt causing the firmware not to operate correctly.

For Mac users, there is a hex loader here: http://paulkaplan.me/HexUploader/

Please note: Stock grbl files will not work with the E3 and E4. If you would like to update to the latest grbl revision, please see our help center article here:

Installing the latest Grbl firmware to the E3 and E4 CNC router.

Please note, this is an advanced method and takes a good understanding of the processes.