Answer to "Why wi-fi,bluetooth and radio does not work on my phone?"I had the same problem with my sony xperia ZL. Both wifi and Bluetooth have no sign of life, I tried to reset to factory default and change the firmware but not resolved. With the help of Vincent Pelletier answer, I followed this wifi and bluetooth chip. Xperia ZL board The board had many probable chips protected by the metal shield. Luckily for me it was the most isolated and the easiest of them. Chip wifi and bluetooth I removed the cap metal. Thinking it might be a reflow problem as said, I put a piece of paper in order to press the chip against the plate and then put this part of the plate on top of a clothes iron on maximum power for a few minutes. Scheme used to make the iron in a horizontal position. Only the part of the chip on iron. This was possible because the part of the plate under the chip does not have any component. The bottom of board This solves the problem.