it will unlock itself once you change from LL or L to HL or H, once you do that, you just have to ride backwards (retro) for about 20 feet to disengage it.
The purpose of the central differential is to transfer the power in 50/50% fixed proportion between the frontal axle and the rear axle, is very convenient whenever you are off roading because if you enter a slippery area with both the frontal wheels, you will still have traction control from the rear wheels.
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