Chuck will not release bit

https://www.youtube.com/watch?v=pNDgV_6k12E
Reverse and Forward Mode: Try putting the drill in reverse mode and hit the trigger, then forward mode. If that doesn't work, tap the tip on the driveway but don't slam it. It should release .

Use a Wrench: First, make sure that the chuck is in the locked position. Next, use an allen wrench to loosen the set screw on the side of the chuck. Finally, unscrew the drill bit from the chuck .

Remove Chuck Collar: Use a wrench or pliers to loosen the chuck collar and remove it from the chuck. Then, use a screwdriver or other tool to remove the chuck jaws and any other components that may be blocking access to the stuck drill bit. Once these components are removed, you should be able to access the drill bit and remove it from the chuck .

Hold the chuck with a strap or pipe wrench and operate the drill in reverse.

Give it a shot of WD40 It may be stuck and seized up. Soak it inside chuck as well.

Try holding the bit in a vice and gently tap the chuck off of the bit and see it it releases the pressure on the jaws.

It is a keyless chuck. Put the drill in reverse (chuck should spin to the left when viewed from the back) and hold the main body area of the chuck with your hand while slowly running the drill. The chuck will open (unless it is broke) and release the bit. You do the opposite (slowing running the drill in forward) for tightening a bit in the chuck.

It is a keyless chuck. You should be able to grab the main body of the chuck and turn it to the left to release the bit. You can also hold the main body of the chuck and run the tool slowly in reverse whcih will also release the bit.

Put the bit in a vise and try hittig the reverse button.If that does not work the tap the three lock tabs in the end of the chuck with a punch and you should be able to undo the chuck.

Try two channel lock pliers.
Hold the bit close the the base with one.
Take the other (cloth comes in handy here to prevent marring) and turn the chuck counter clockwise to release.

Alternative (little WD40 on the chuck)
One channel lock plier hold the chuck and put the drill in reverse.
The WD40 should allow the chuck to release easier.

Good luck!

if you trap the chuck in a bench vice or alike and then use the drill in reverse in short bursts until it loosens a good spray with wd40 will also aid the situation

Try using the low torque setting on the drill when reversing and something to assist you getting a better grip to hold the chuck from spinning when reversing. This may help.

Good Luck