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Samsung A5 & J7 Strange Problem

actually set was water damage
now after service set ok but no network
then i see that baseband unknown and imei blank, some time shows imei ok and also baseband ok, but no network/no service.
i cant understand from where comes the problem, i confused, i flashed, write qcn, repair imei etc but same sometime baseband ok again some time baseband unknown.
please guide me masters for repair this sets
i m waiting


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