Currently there are 3 updated firmwares for the Flow X, Flow X Offroad and Flow X Stock Spec esc range. All three esc are the same physically inside and have same ratings. The only differences are:

Flow X TC spec includes:
cooling fan for esc (30mm)
shortened rx wire
short set of fan screws
long set of fan screws
v4.1 firmware

Flow X Offroad includes:
longer rx wire
no fan included
long set of fan screws
v3.1 firmware

Flow X Stock Spec includes:
longer rx wire
no fan included
v5.1 firmware

All three updated firmwares (v 4.2, 3.2 and 5.2) only fix an issue with some motors and the sensor detection. (ie. blue led light stays on to indicate that there is an issue with the motor or sensor wire.)

To fix this issue, you can update the firmware to the above mentioned and available from the LRP website or you can just turn the motor over when or if it happens (ie. rotate pinion or spur gear until esc detects sensor position)

The new updated firmwares fix a bug in the original firmwares, but it is NOT required and it does not change or improve original firmwares.

Hope this helps and makes sense.

Thanks,

Leonard.