My phone is F240S and have this problem too when I try to flash from custom rom to official Kitkat 4.4.2.
Signal is gone and I try to flash back it still gone. Even try Sphinx rom for kitkat still don't have any signal.
Any solutions? thx
i am trying to go on 4.1.2 f240k stock but i find only 2 links one to paidu .... and one which is domwloding way to slow ...
i am searching on google and i will post here if i will find any solution
ps , by the way my imei its correct
I manage it to fix it ...
Look in your build.prop and see if something its not normal
Ps i change the 0 from the linr above with ESA ... depends on your country or region asia or usa ...
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