That may or may not work. In some versions of the software, you can change the limit in the GUI, and it appears to take, but actually nothing has changed and you still won't go higher than 120 m. In that case you need to contact Yuneec in your country, who will provide you with the correct software to do this, if it is legal in your country to do so, which I suspect it isn't unless you can provide them with some sort of professional exemption. Polish drone law states you are not allowed higher than 150 m (fixed, not AGL), so you would be operating illegally were you to set the value higher than that and exceed it in flight. And because every flight you make is logged you would be carrying around the evidence against you, every time you were out with the machine.