Had dead battery in 2002 honda civic got jump now word CODE in radio display

Look in your owners manual envelope for your radio card and unlock code and serial number. If you cant find unlock code try this website. https://radio-navicode.honda.com

Try disconecting the positive terminal of the batery for sevral minets (5-10) this will reset the brain box memory for the stero aswell as for the car it self.

what caused the batery to go dead in the first place?
things that i can think of :
1) left headlights on over night
2) bad altenator not charging batery
3) battery is old and not taking a charge anymore
4) new stero installed incorectly and drainging the batery
have you resently installed a new stero or amplifyer?
is the turn key igntion system hooked into the amp/stero antena lead so that thy are shut of when the ignition is?
of note: new streo >theres a blue wire marked ant that goes to the amplifyer if not there you need to find the orange accsesory wire coming from the turn key igntion>check for power when ignition is in the on & off states could be yellow in some cars but is usaly orange if this wire has on and of state controled by the turn key igntion this would be the wire to tap into for the amplyfire and the radio main power
check your radio's instaltion guide for code errors
its posible that when hooking up the jump it was done incorectly and blew up the radio
ie postive and negative where fliped
hope this helped :)