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Dear szaboar,
To rule out the possibility of an existing software error, I suggest you to flash your phone with SP Flash Tool, choosing the 'Firmware Upgrade' option in the flasher application. That process will completely rewrite the whole software content of your device. - You will lose your user data.
Link: http://goo.gl/BqUZfo
However, if once you could get a very weak signal, then your case is probably a hardware issue. Simply the antenna film has a bad or no connection to the motherboard. That probably can be repaired easily but it needs to disassemble your phone. I suggest you to contact your reseller to help you to resolve your problem.
Regards,
Bence
P.s.: Amennyiben érdekel, van magyar nyelvű fórum is itt: http://community.umidigi.com/forum-87-1.html
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