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the red box is probably the fusable links and cover on the positive terminal of the battery. It should flip up so you can see the positive terminal and disconnect it. Not 100% sure about the radio code on BMW's. In general some lose the code, others dont
I would check with vom voltage at battery terminals and at starter to ground. Is possible could be a fuse or fusable link but I think the positive goes straight to starter and power distribution fuse or fusable link
First make sure that the battery is charged up all of the way and that a positive 12V current is reaching the positive terminal of the starter motor. You can test it with an inexpensive 12V test light available from any auto parts store for about $10. You need that for diagnosing any electrical problems if you have checked the fuses and they are all good. Its also possible that the fusable link got shorted out and that will stop the car from turning over. The fusable links are 3 wires sticking up from a small box on the drivers side shock mount in the engine compartment. Check that they are not burned. If all of that is good, then use your test light to see if 12V current is reaching the ignition switch under the plastic cover behind the steering wheel and on the opposite side of the key.