Repairing "3 Cree XM - L T6" 2 x 18650 Flashlight - help!

So my dad ordered one of these but it wouldn’t power on. He ran out of patience and got another and then gave me this one.

I have confirmed it actually does not work. The circuit board behind the LEDs is free floating… I expect this should be secured to something?

I’d like to crack this thing open and see if it can be repaired before I throw it out. Can someone tell me how this thing comes apart? I have separated the “head” from the body of the flashlight but I can’t see how to actually get the circuit board / LEDs etc out. Does it require specialist tools?

The flashlight in question - https://www.gearbest.com/led-flashlights/pp_71479.html?wid=1433363