I did it! It is working again!
Ok, it is actually pretty simple. You must first disassemble the base (there is a step by step in the product page right here in ifixit - basically there are screws that you need to unscrew in the bottom of the base, hidden underneath four white rubber caps), then disconect the cables that have a little rectangular connector. Then you pass these cables and the antenna through the hole in the middle of the base board. After that, unscrew the four screws that fix a big gear underneath the camera piece. Then, you may open the two halves of the ball and do whatever you need to do inside. There is another rectangular connector inside the ball, it also can be easily disconnected to completely split the ball.
After that, it was easy to reconnect the flat cable of the camera. It is working again, after reassembly.
Here are some pictures of the camera being disassembled, so you may know what to look for.
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