1_locked bootloader ( first device from sony has bootloader can't be unlocked ).
2-extract system.ext4 is not available because its signed.
3-we were in a fight till we got worked cwm.
4-lower devices like xperia m ( has been released in august 2014 ) has been updated to 4.3.
5-old UI and most of apps are old.
are sony punish us because we have bought xperia c or what ?!!!!
so like we worked together till we have got cwm we must do it again till xperia c get updated.and if any one of sony customer services said its related to mediatek because they didn't give us the source its not related to us we have bought from sony not from mediatek and we want the development away from mediatek or anything as sony rules says.
here is the link to complain http://talk.sonymobile.com/t5/Xperia-C/bd-p/Xperia_C.
guys please this is the only way to force sony to update the device so every one here must complain. i'm sorry for prolong but am really angry and disappointed.good luck to all !!!