Stock tft need help me topic

i install cm 11 beta 3 on my xperia m my phone give too many problem like in call voice too low,some time hanging,network switch too 2g/3g not working perproly,etc

i want to go back stock plz give me stock tft file of 15.1.C.2.8 i also have ta backup also tell me how to relock bootloader

plz give me mediafire link of tft file if possible thnx in advance

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