Key not working in Honda jazz

Joined
19 Jan 2021
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United Kingdom
During the recent snow I had a completely flat battery so I had a go at jump starting the car but although it was turning over I got nothing not even a splutter
I have now noticed I have the green key light flashing on the dash so the ECU is not recognising the key same thing with the spare.
Would a flat battery cause this ?
And is it a main dealer thing the get recoded?
It's not a key fob with buttons etc just a key
Honda jazz 05
Help please....
 
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