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The seller finally responded, but instead of offering a repair or varanty claim they offered that I buy from them an used USB board and replace it myself or in some repair shop. After lots of mails I finaly managed to repair the phone by myself. In the process i had to open it, so now I don't have varanty anymore. For everyone with the same problem, here is the solution:
Tha flat cable connecting mainboard and USB board was partialy disconnected on the motherboard side. I think it is the design flaw, because you can cause that by sliglty pushing right beneath the first SIM slot when inserting the SIM card. I did disassembled the whole phone, but repair can be done just by unglueing the black sticker behind battery and than by using some tool to reinsert the connector back up.
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