Xperia L stuck on SOny Logo

hi .I just bought an Xperia L (C2105); after few days of using and downloading guge number off apps it got freezed and when i tried to restar it my xperia shows nothing but the Sony Logo until the battery drains so i tried using flashtool but when i select the firmware it says this
x1.this bundle is not valide
x2.thisbundle is not valide
.......
.......
so i searshed and found that there is another tool from sonymobile called emma to flash sony devices and i downloaded it but whenever i connect the phone to the laptop it says this device is locked and cannot be flashed try to unlock the bootloader

so again i went to flashtool and pressed unlock bootloader and connected the Xperia L but after a few seconds the flashtool said that my phone bootloader cannot be officialy unlocked. and i need to check uknown sources and debug mode but thats clearely impossible as the phone is stuck
so i went to pc companion and pressed update service and connected the device and it detected it as soon as i plug the usb cable but it says that i need to update my pc companion and get the version suitable for my device which im sur i downloaded the exact vesion for the xperia L from the sony mobile website

So basicaly non of the tree programmes allow me to flash my xperia L and now i dont know what to do im stuck with an unusable phone .
is there something im missing here flashing a device should be a peace of cake but this device is a hell of headacke
any help please