Hi been trying to read my ECU it keeps saying ECU reports that security access is not supported.

Here is the screen shot:

Starting loading of info.
Cancelling loading of info.
Validated FTDI device is in dumb mode.
Disconnected
Connecting...
Starting slow init connection.
Connecting to address 0x01.
Slow init succeeded.
Switching to KWP1281 session.
KWP1281 connect info: ¸D0907551K  2.7l V6/5VT     G   0001

any ideas?
cheers Matt

Hi I have changed the buld rate still getting

Reading ECU flash memory.
ECU reports programming session preconditions have been met.
Negotiating communication timings.
Successfully changed to new communication timings.
Requesting security access.
ECU reports that security access request was rejected.
Starting diagnostic session.
Unable to properly start diagnostic session, attempting to continue with current undefined session.
This can occur if the security lockout is running, or the engine is running. Please turn off the ignition and retry if this continues to fail.
Negotiating communication timings.
Successfully changed to new communication timings.
Requesting security access.
ECU reports that security access request was rejected.
Reading ECU flash memory failed.

Yes I connected to the car at max rate then changed to the lower rate as you said still getting the message.
Do you think someone has locked the ECU?

i has the same error (as i remember) when flashing on the bench
power to pin 121 solved this problem

RS4 (in your case 551K) is not ME7.5, it is ME7.1

Try pulling the cluster fuse?

Also try to flash the ECU on the bench (shouldn't need bootmode).