Very well said everyone and good points highlighted.
@Rahimdad this seems like a motorsport highly modified Patrol and not street legal one, that's why there is no hood and number plate. And after the impact, you can see the huge intercooler in front and it might be having twin turbo's from the sound it seems. They must be making to Faya on the trailer for testing for a desert challenge.
We have seen similar highly modified 4x4's practicing but not all catches fires nor flip.
Here the main reason for flip was to create a sand fountain for the spectators.
Here is my list of observation from this video:
Creating sand fountain for the spectators
Driving in two wheels to have a sand fountain
Excessive acceleration while going downhill and in 2WD to have the biggest sand fountain
Fishtailing to continue the splash and eventually losing the control and causing a flip
"Maybe" using special fuel that caused the fire after the flip
"Maybe" boosted the turbo to the max to cause the explosion after the flip
Lesson to take away for all "REGULAR" offroaders:
Never climb or descend the dune in 2WD
If still car fishtail, slow down and counter steering
Never do excessive acceleration while coming down
Have fun splashing the sand or do donuts in 2WD but on a flat ground
Always drive RTA approved modifications as safety is paramount than a little bit of fun
Please feel free to add any more reason/lessons if I have missed any.