How to enable the "override" function of a cheap jump starter pack 

WARNING!
This modification is not safe and you can do it at your own risk!
This modification disables all of the protections and if you reverse the polarity or don't follow the safety instructions, it may cause damage or catch on fire.
This video shows how to modify a cheap jump starter pack with "smart" clamps and force the booster to charge a dead battery.
Only the more expensive boosters have this function, so I found a way to do it for a cheap one at almost no cost...
Now you can start your car if the battery is completely dead.