Hi Folks,
The GAP app cannot put a 2017 RR into service mode to replace the rear brakes, is there a way todo this manually?

From Topix:

ACTIVATION
CAUTION:
This procedure requires the vehicle in the Park or Neutral position, with the ignition turned ON (the engine must be OFF) and the parking brake system released.
NOTE:
This procedure allows the parking brake to be released when removing and installing new rear brake pads or brake discs.

Press and hold the parking brake switch in the release position.
Wait 2 seconds.
Press and hold the accelerator pedal in the wide open throttle position.
Wait 2 seconds.
Turn the ignition Off and back On immediately.

NOTE:
An audible noise will be heard to confirm that the parking brake has been released in Service Mode.
Release the accelerator pedal and release the parking brake switch to the neutral position.

DEACTIVATION
CAUTIONS:
This procedure requires the vehicle in the Park or Neutral position, with the ignition turned ON (the engine must be OFF) and the parking brake system in Service Mode.

Once the rear brake pads or brake discs have been installed, the Service Mode must be cancelled.
Press and hold the parking brake switch in the apply position.
Wait 2 seconds.
Press and hold the accelerator pedal in the wide open throttle position.
Wait 2 seconds.
Turn the ignition Off and back On immediately.

NOTE:
An audible noise will be heard to confirm that the parking brake has been released from the Service Mode.
Release the accelerator pedal and release the parking brake switch to the neutral position.

Thanks will give that a go...

if using the GAP tool, make sure that when you are activating it that the EPB is already in the off position. I made the school boy error of thinking that the GAP tool didn't work when it does - it just requires the handbrake (EPB) to be off - it will then wind the brakes further back..

Yup that's how I did it but gave the E4 error which GAP will look at when they have time!

interesting. I know the e4 error code is just a generic fail.

Are you on the latest software for your GAP tool ? -

Yes they made me update it, so i guess they are able to remotely also see the logs and fail... Maybe it does not work on the later cars and they need to make some software changes?