For the spoiler, try disconnecting the battery, waiting a few and reconnect then use the spoiler switch in the footwell to retract. Listen to see if you hear motor.
Lots of strange things can happen when introducing a charge (new battery) to a dead system. Happened to me once, new battery installed and anything with a motor (windows, spoiler, etc) sprang to life and needed reset.
For the latch, do as suggested...trip the lock with a screwdriver and then release using button.
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