To run 0.5bar the actuator it stuck open or being told to open by the ECU i.e the ECU stops the BCS working (it acts as an electronic bleed valve)
Pull the hose off the actuator then go for a careful drive. This will force the actuator to remain closed and you will boost upto the boost limit/fuel-cut safety limit. Take it easy and just do it once or twice to confirm it will boost.
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