So the problem is that I needed to connect an external antenna but the cap which covered the connector was stubborn. After 20 minutes of fight and numerous tool I have finally managed to pop off the cap. Unfortunately the antenna connector started rattling inside the phone and then fell of. I have no connection at all. Below is a photo which shows the missing connector (red arrow). With the green arrow I have pointed an area I have doubts about: is anything missing there as well? The second photo shows my proposal to omit the connector and connect the circuit. But I am not sure of it, it is just a suggestion. So which points should I connect to have my phone working again?