@OBum_2020 said in M557 number of probe points:
RepRapFirmware for Duet 2 WiFi/Ethernet version 2.0(RTOS) running on Duet Ethernet 1.02 or later
That's quite old firmware. You may wish to update to firmware 2.05.1 and DWC 2.0.7.
The easiest way is to simply upload this zip file as is (don't extract it) to the /sys folder via DWC.
https://github.com/Duet3D/RepRapFirmware/releases/download/2.05.1/Duet2Firmware-2.05.1.zip
https://github.com/Duet3D/RepRapFirmware/blob/dev/WHATS_NEW.md
See the release notes for all that has changed in between, you may need to make a few changes to the config files. This would put you on good footing for the eventual upgrade to RRF3.