The identifiers a box carries

Every box answers with the same six configuration keys. The first four are read-only and name the product; the last two place it on the bus.

Key	What it is	Access
ProductId	the finished product — the nine-digit number that says which firmware this box carries	read-only
HardwareId	the board inside the box	read-only
SoftwareId	the program	read-only
SoftwareVersion	the version of that program	read-only
FonctionGroup	what kind of device this is	read-only
InstanceNum	which one of them it is	read-write

These come from the MUXEN ERP, and they are how the Brain knows which firmware belongs in which box.

Read them before touching anything:

muxen-uds -i can0 -d <address> readconfig --only-name ProductId \
                                          --only-name HardwareId \
                                          --only-name SoftwareVersion

<address> is the device address — see How a device is addressed for how it is formed.

WARNING

HardwareId does not always separate two boards that look alike. On some lines two boards share one hardware ID, and the software version is the only thing that tells them apart. The product's own manual says which case it is in.