02WRX wont start

[EliteD]

Hi guys, new here. Got an 02wrx havin problems disarming the immobiliser.

i hvae a red key flashing on the dash constantly 

i have no light flashing at all on the alarm system next to the clock.

i locked the car using key, went for a walk come back and the key fob wont arm or disarm the immobiliser and alarm.

had an issue the day previously with my fob, the button had died but got it recovered and got my spare fob amd that worked fine a couple times. 

Now as i said cant arm or disarm.. 

no light flashing in centre and red key flashing constantly 

cant figure out what this is

have disconnected Battery for 10 mins to see if that clears it. But nothing