So guys I took the 4.2 version and updated its base rom, recovery and kernel.
This version is authorized by mato_d007 yet is a UNOFFICIAL version.
Here is the Changelog
Xperia D 4.3_Unofficial
-New CM10 base: 20131030 by Quarx which brings updated wifi drivers, wpa_suplicant, Stability fixes and fixed video playback
-Updated to latest Blechd0se Aerokernel which brings stability fixes, better interactive Governor and sweep2wake
-Updated to latest TWRP (kitkat Capable) and latest bootmenu.
-Same as the 30.10 CM10 Build and possibly more (I do not know if there is any)
-This base is about 20MB bigger so that means that you have to install less apps in system
-First Boot takes a long time.
-Bluetooth not working. Fix under links in this same post
I am no dev but I will try to solve any problems with the ROM
I take no Credits for this you should thank Quarx,Blechd0se and mato_d007
Download and copy the latest ROM zip to SD Card
Reboot into Recovery Mode (CWM or TWRP)
ALWAYS make a Nandroid back up, just to be sure
Select install zip from sd card
Select choose zip from sd card
Select the new ROM zip
Select Yes - Install update
I recommend to use CUSTOM install and to install ONLY the Indispensable and install from the rest from the playstore
Wait until the Installation is finish *IMPORTANT - DONT WIPE AFTER INSTALL THE ROM*
Select reboot system now
Wait 5-10 min (if nothing happens after 10 min you did something wrong, try removing battery and rebooting)
I use these OC settings:
Credits to atulclassic