Get a DICE-clone/Mongoose JLR pro/Super J2534 adapter, a Laptop with Windows 10/11 and internet access, a charger that is able to maintain a constant load of 8 Ampere. Connect everything to your car, switch the ignition to pos. II (ignition on, engine not running) , start vdash, log in, click the connect button in the top left corner, click the decode CEM button, click the green button somewhere on the left. Wait for up to 24 hours until the PIN is decoded. The car goes into programming mode while the decode is running and can't be locked or used in any way. You can pause/restart the decoding at any point, the progress is stored on the vdash servers.