Here is the homedelta.g file:
; homedelta.g
; called to home all towers on a delta printer
;
; generated by RepRapFirmware Configuration Tool v3.3.15 on Tue Jan 03 2023 19:23:07 GMT+0100 (Midden-Europese standaardtijd)
G91 ; relative positioning
G1 H2 X455 Y455 Z455 F200 ; move all towers to the high end stopping at the endstops (first pass)
G1 H1 X-5 Y-5 Z-5 F200 ; go down a few mm
G1 H2 X7 Y7 Z7 F360 ; move all towers up once more (second pass)
G1 Z-5 F6000 ; move down a few mm so that the nozzle can be centred
G90 ; absolute positioning
G1 X0 Y0 F6000 ; move X+Y to the centre
The towers are all wired correct, no other home related .g files are in the /sys folder on the sd card.