Lowrider GRBL ramps 1.4 problem

Hi everyone! I just set up my Lowrider with Ramps 1.4 and GRBL 5X from this repository: GitHub - fra589/grbl-Mega-5X: 5/6 Axis version of Grbl, the open source, embedded, high performanc

I got almost everything is working fine, even the homing/autosquare which is very cool, the only issue I have is that the motors don’t stay engaged all the time, so when I rise the Z axis it falls back down after a second (as the Lowrider name implies…)
I think it might be something related to the firmware, anyone can help me?

$1=255

This command will cause GRBL not to disable the stepper power once engaged.

The $1 parameter gives a seconds count for how long the steppers remain engaged after the last movement command. Setting it to 255 is “infinite”.

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Thank you very much!