Hi
What battery are you trying to run? And if I struggle to explain well,
@ajdragon helped me awhile back
I think LiPo setting is stock I believe for Blx
To set NiMH you you have to turn on the ESC while pressing that set button next to the ESC on switch where it will beep.
One beep = LiPo mode (low voltage cutoff @3.2v)
2 beeps = NiMH mode
3 beeps = no cutoff
There are other beeps but those are for throttle I believe... which I haven't tested.
hopes this helps!