Bench flash is open ecu and probe directly to the board. Patch may be available soon so any subsequent tuning can then be done via obd2 port
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Seems to have been dropped by the wayside DISCO3.CO.UK - View topic - Discovery 4 3.0L Remap Tuning with control via OBD
Did you have the EGRs closed in the remap?
If so, I highly recommend removing the blending valve from the shaft in the intake. When the valve closes on light throttle etc removing it prevents drawing crank case gases into the intake.
I did a course with a guy who’d had his upgraded, although I don’t remember if it was just plug and play or a flash. He had a different exhaust on too,, reconed it went well.