You shouldn't unscrew/screw CFL Bulb from its tube because there is a very small risk that it will break (Especially if it has the tubular shape (2U, 3U and 4U)). Try to unscrew/screwing it from its plastic base.

Nice tutorial but you don’t have to remove the passive radiators because its not that it gets more difficult, but it is that after the passive radiators are removed, the sealing glue will break, resulting in a non waterproof speaker. so, the only thing to do, is after you remove the grill, remove the 4 screws, take out the driver and de-solder the red and black wires and after you get the new driver, solder the red wire to positive and the black to negative. Now do these steps backward. Then you’ll be resulted with a brand-new looking JBL charge 4. Trust me, I removed passive radiators of the charge 4 and it resulted me with an air leak. So do everything except for removing passive radiators.

Why they removed the solider mask in the wrong place and not where the antenna is?