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联想手机维修指南。

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weak SIM signal P780 chinese version. EU ROM.

Very unstable signal on my P780. For example on a table it has full signal and at the same place but in hands - it is gone. Tryed different modems but still the same... my ROW is s124, surrently modem is v52 from lenovo S920.(it is more or less OK).

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Your phone maybe has a hardware frequency restriction :( I'll also try soon the modem img replace, I have the same problem, praying...

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change modem. i use from S920. write me pm i send you file

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Sergey Xx 将永远感激不已
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