S5839i how flash ?

FOR SALE HTC HD 2 THIS IS RUNNING ANDROID 2.3.5 CYANOGEN MOD 7
HI THERE FOR SALE IS MY HTC HD 2 THIS IS RUNNING ANDROID !!!! THE PHONE HAS A PROBLEM WITH THE CHARGING CONNECTOR ? IT REALLY NEEDS A NEW ONE. BUT I HAVE A BATTERY WALL CHARGER THAT I USE SO IT IS STILL OK TOO USE ! YOU GET THAT ALSO. IT IS IN VERY GOOD CONDITION ALL ROUND. 100% WORKING .APART FROM WHAT I JUST STATED.? THE PHONE IS OPEN TO ANY NETWORK . AND IS FULLY BOXED !! THERE IS A SPARE HIGH POWER BATTERY THIS IS LARGER IT ALSO A SPARE BACK COVER TO GO WITH THIS. AND A NEW SCREEN PROTECTOR . IF INTERESTED PLEASE TEXT OR CALL THIS NUMBER 07868874616. MANY THANKS. MY PX / SWAP / FOR A HTC SENSATION ??? WILL PAY A BIT OF CASH AS WELL I LIVE NEAR BLACKBURN