Hello I am in need of help to save my lumia 1520. I made the mistake of flashing my lumia 1520 (RM-937) with a lumia 1520 (RM-938) ROM ever-since my phone started acting out. I flashed the phone back to its original ROM which is Hong-kong ROM with windows phone recovery tool, it has not fixed the issue. The phone does not connect to GSM network anymore. It appears that the band might have been messed up. Can anyone help?