I had my SHAPE installed last weekend.
A two amplifier, eight speaker configuration.
After powering it up, it would not accept the design ID and the status showed SlaveUpgradeFailed in the B&O app. I could still play music through it, but the sound was pretty bad and unable to be adjusted.
The B&O installer was unable to resolve the problem and left saying I should contact the shop and have someone come and troubleshoot it...pretty disappointing.
After some investigation, I concluded the slave amplifier needed to be reset. It appears a reset of the CORE does not reset the slave, only the Master.
After the slave reset it worked perfectly. It accepted the design ID and there were no more error messages.
For anyone else hitting a similar problem, this is what I did to reset it.