Could you post these numbers?
**EDIT**
I found it.
To get engineering mode, just dial this: *#*#2486#*#*
https://www.hardreset.info/devices/motorola/motorola-moto-z-force/codes/
Would this work for the original Z Force?
*EDIT*
I tried it,
Iteration: 0
Tried: 00000000000000000000
Returned: (bootloader) slot-count: not found
(bootloader) slot-suffixes: not found
(bootloader) slot-suffixes: not found
...
(bootloader) WARNING: This command erases all user data...