If you have a vigotech laser engraver L7, you can use lightburn .
before you need to flash the mainboard with the original grbl, you can find it, in the folder of your vigotech software
his name:standard grbl1.1e, see the picture
i found this on the website of vigotech
in this folder you will find the uploader for grbl, and a png file who explain how use and configure xloader
i give you the grbl in the link bellow, but you will need to rename it in .hex
Standard_Grbl_v1.1f .txt (83.4 KB)