To Upgrade your HTC Butterfly s 9060 Dual Sim From 4.1.2 to Android 4.4.2 Follow These Steps.
Download 4.4.2 rom zip
Install adb drivers and turn off your Htc 9060
Press and hold volume down and power key at the same time.
Then select the fastboot mode.
now connect your mobile to pc and wait for drivers installation
unzipt adb.rar and place the rom file in to this folder (rename the rom file to rom.zip)
Right click on adb folder with shift key and select open command widow here.
now copy and past these commands in command window.
fastboot oem rebootRUU
phone will restart in ruu mode wait for it
then type this command and press inter
fastboot flash zip rom.zip
Now wait for installation this may take time.
when you see the command window complete the installation the press inter
and type the command
you phone will restart in normal mode enjoy android kitkat 4.4.2 on your htc 9060.