engine cranks over ,,no start ignition key left on over nght

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key left on battery dead, charged battery, security light now flashing, no start, have done 10 min and 30 min recovery, still no start,, changed ECM and passlock module no start, no codes showing ,shift solenoid not working. fuel pump good ,coils good, injectors good, dealer wants to try changing everything,,I want to know if there is a bypass for the security system to allow the car to start