Flashing Gsender firmware

I’m having control issues and have tried flashing the firmware in Gsender (1.5.7). The flashing process is asking for a hex file. I have no idea where to find a hex file.

I’m running a Sienci Labs Longmill MK2 48X30, SBL EXT. Just installed closed loop stepper kit.

Thanks, Chuck

You can get the firmware (the hex file you are referring to) here. Read through and follow the instructions.