S820 - very poor GSM signal

Dear All,
I have purchased a Lenovo S820 smartphone. It is not available in Hungary to buy, so I purchased it from a webshop, and it was shipped from Hong-Kong.
The phone would be otherwise great, but the GSM/3G signal reception is really bad....the device has very limited useage as a phone...I use it with two SIM cards, and both have terrible reception (in areas where normally reception is good).
Can anyone suggest a fix, please?
Thanks,
Sandor

The problem was resolved following this article:
http://lenovo-forums.ru/topic/1702-%D0%BF%D1%80%D0%BE%D1%88%D0%B8%D0%B2%D0%BA%D0%B0-%D1%80%D0%B0%D0%...
Basically I changed modem firmware to V51 (just replacing /system/etc/firmware/modem.img)

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