it was the G30 that was missing :
the new code :
; Uncomment the following lines to lift Z after probing
G91 ; relative positioning
G1 Z5 F100 ; lift Z relative to current position
G90 ; absolute positioning
G1 X80 Y50 F6000 ; put head over the centre of the bed, or wherever you want to probe
G30 ; lower head, stop when probe triggered and set Z to trigger height
GREAT ! thank you 
Everything is now working as expected!
I don't think so, if I remember right they are more or less the defaults :
My homez.g :
; homez.g
; called to home the Z axis
;
; generated by RepRapFirmware Configuration Tool v3.2.2 on Thu Jan 28 2021 17:56:19 GMT+0100 (CET)
G91 ; relative positioning
G1 H2 Z5 F6000 ; lift Z relative to current position
G1 H1 X-405 Y-405 F1800 ; move quickly to X or Y endstop and stop there (first pass)
G1 X80 Y50 F6000 ; Move head in postion to trigger z-stop
G1 H1 Z-405 F1800 ; move Z down until the endstop is triggered
G92 Z0 ; set Z position to axis minimum (you may want to adjust this)
; Uncomment the following lines to lift Z after probing
;G91 ; relative positioning
;G1 Z5 F100 ; lift Z relative to current position
;G90 ; absolute positioning
and the homeall.g :
; homeall.g
; called to home all axes
;
; generated by RepRapFirmware Configuration Tool v3.2.2 on Thu Jan 28 2021 17:56:19 GMT+0100 (CET)
G91 ; relative positioning
G1 H2 Z5 F6000 ; lift Z relative to current position
G1 H1 X-405 Y-405 F1800 ; move quickly to X or Y endstop and stop there (first pass)
G1 H1 X-405 ; home X axis
G1 H1 Y-405 ; home Y axis
G1 X5 Y5 F6000 ; go back a few mm
G1 H1 X-405 F360 ; move slowly to X axis endstop once more (second pass)
G1 H1 Y-405 ; then move slowly to Y axis endstop
G1 X80 Y50 F6000 ; Move head in postion to trigger z-stop
G1 H1 Z-405 F360 ; move Z down stopping at the endstop
G90 ; absolute positioning
G92 Z0 ; set Z position to axis minimum (you may want to adjust this)
; Uncomment the following lines to lift Z after probing
G91 ; relative positioning
G1 Z5 F100 ; lift Z relative to current position
G90 ; absolute positioning
Hi to all !
I have upgraded my tronxy X5SA-400 with the duet2-wifi (fw 3.2.0) and I have managed everything to working fine but I have one last problem, I'm not able to calibrate the Z-Probe !
Whatever I try after Calibration my nozzle stick a couple of millimeters over the bed which is really sad !
I have follow this procedure : Test And Calibrating the Z probe but each time I restart the nozzle stick a couple of mm over the bed.
The first try was with this Z-probe config :
; Z-Probe
M574 Z1 S2
M558 P1 C"!zprobe.in" H5 F100 T36000
G31 P250 X-32 Y-10 Z1.89
M557 X60:320 Y60:320 S65
After some research I tried to change the probe type to P5 :
; Z-Probe
M574 Z1 S2
M558 P5 C"!zprobe.in" H5 F100 T36000
G31 P250 X-32 Y-10 Z1.89
M557 X60:320 Y60:320 S65
I have adjusted the G31 Z value as indicated in the calibration procedure but nothing changed after homing and getting the Z to 0 I'm not touching the bed at all.
Has anybody I great idea ?