@phaedrux

Works fine !!!! thnak you very much !!! you saved my weekend !!

@phaedrux
Thanks !! so i have a lot of homework :p.
the firmware is updated to 3.3.
I was reluctant/worried to remake the config files... but... yeah... it will better you're right ! i looked at the 3 links, i can make it !! (cross finger)
M401 and M402 was working.

homedelta.g
; homedelta.g
; called to home all towers on a delta printer
;
; generated by RepRapFirmware Configuration Tool on Mon May 22 2017 22:56:20 GMT-0400 (Eastern Daylight Time)

; Use relative positioning
G91

; Move all towers to the high end stopping at the endstops (first pass)
G1 X700 Y700 Z700 F4800 H1

; Go down a few mm
G1 X-5 Y-5 Z-5 F1800 H2

; Move all towers up once more (second pass)
G1 X10 Y10 Z10 F360 H1

; Move down a few mm so that the nozzle can be centred
G1 Z-5 F6000

;RESET BLTOUCH
;M280 P7 S10 I1 ; DEPLOY
M280 P0 S10 ; Deploy
;M280 P7 S90 I1 ; RETRACT
M280 P0 S90 I1 ; Retract

; Switch back to absolute positioning and go to the centre
G90
G1 X0 Y0 F6000

Thnaks again. i'll be back !

Hello Everybody,

thanks to all for sharing so much info !
note : the printer was working fine before i triyed to adapt the BLtouch fixation. and this below happen...

I have tevo Little Monster with a Duet 2 Wifi (Circuit: Duet WiFi 1.02 or later) and a BLtouch Smart V3+ (with the plastic pin)
I just updated the from RRF2 to RRF3.0 (RepRapFirmware for Duet 2 WiFi/Ethernet 3.0 (2020-01-03b3)) (not yet other upper rev). with Duet WiFi Server Version: 1.23
I changed the Config and override config with the support of this post https://forum.duet3d.com/topic/18821/tevo-little-monster-calibration-issues-with-rrf-3-1-1
the white wire is on Z-Probe in
the black wire is on GND
the red wire on 1) +5V
the brown wire on 2) GND
the Yellow wire on 13) Heater4

directly from the bltouch (no intermediate wire)

my BL touch is deploying/retracting when using
M280 P0 S10; deploy
M280 P0 S90 I1; retract
M401 and M402 are working fine
G30 don't cause the pin to drop.

I did follow the commissioning guide https://duet3d.dozuki.com/Wiki/Connecting_a_Z_probe#Section_Commissioning_Testing_RepRapFirmware_Num_3

But on the Duet Web Control, the Z-probe value remain at 0 unless when I try (maintain with my finger) to stop deploying (like if it was touching the bed). in that case only
the Z probe value swith to 1000 in a red cell. it does the same if i disconnect the black and white wire.

when i start the printer, the Bl touche out/in twice.
then i push the homing button, the printer move well up to the limit switch but then give me value of 9999.9 on each axis

i read a lot but don't find why this behavior happen even if i have the feeling it is a f....g stupid things i missed. i do apologize for my english, i'm french...
i tryed another BLtouch and did the same... next step would be to change the board
Any help or idea are more than welcome...

below the config and override.
; Configuration file for Duet Ethernet (firmware version 1.17)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool on Mon May 22 2017 22:56:20 GMT-0400 (Eastern Daylight Time)

; General preferences
M111 S0 ; Debugging off
G21 ; Work in millimetres
G90 ; Send absolute coordinates...
M83 ; ...but relative extruder moves
M555 P1 ; Set firmware compatibility to look like RepRapFirmare
;M665 R157 L400 B175 H493 ; Set delta radius, diagonal rod length, printable radius and homed height
;M666 X0.222 Y-0.373 Z0.151 A0.00 B0.00; Put your endstop adjustments here, or let auto calibration find them
;M666 X0 Y0 Z0 A0.00 B0.00;
; M665 and M666 in Override.config.

;Axis Limit RRF3
M208 Z0 S1 ; Set minimum Z

; Endstops RRF3
M574 X1 S1 P"xstop" ; configure active-high endstop for low end on X via pin xstop
M574 Y1 S1 P"ystop" ; configure active-high endstop for low end on Y via pin ystop
M574 Z1 S1 P"zstop" ; configure active-high endstop for low end on Z via pin zstop

; BL-Touch RRF3
M950 H4
M558 P9 c"^zprobe.in" H5 F100 T2000
M950 S0 c"^exp.heater4"
G31 X-21.04 Y-12.14 Z1.38 P10 ; Set Z probe trigger value, offset and trigger height
M557 R130 S20 ; Define mesh grid

; Drives RRF3
M569 P0 S0 ; Drive 0 goes backwards
M569 P1 S0 ; Drive 1 goes backwards
M569 P2 S0 ; Drive 2 goes backwards
M569 P3 S0 ; Drive 3 goes backwards
M584 X0 Y1 Z2 E3 ; set drive mapping
M350 E16 I0 ; Configure microstepping without interpolation
M350 X32 Y32 Z32 I1 ; Configure microstepping with interpolation
M92 X160 Y160 Z160 E2657 Set steps per mm (previous with flyingstruder 1584)
M566 X1200 Y1200 Z1200 E2400 ; Set maximum instantaneous speed changes (mm/min)
M203 X39960 Y39960 Z39960 E4000 ; Set maximum speeds (mm/min)
M201 X2000 Y2000 Z2000 E1500 ; Set accelerations (mm/s^2)
M906 X1200 Y1200 Z1200 E600 I20 ; Set motor currents (mA) and motor idle factor in per cent
M84 S15 ; Set idle timeout

; Heaters RRF3

M308 S0 P"bed_temp" Y"thermistor" T100000 B4607 C8.950070e-8 R4700; define the bed temperature sensor
M950 H0 C"bed-heat" T0; heater 0 uses the bed_heat pin, sensor 0
M140 H0 ; the bed heater is heater 0
M143 H0 S120; set temperature limit for heater 0 to 120C

M308 S1 P"e0_temp" Y"thermistor" T100000 B4138 C0 R4700; define the E0 temperature Sensor
M950 H1 C"e0_heat" T1 ; Heater 1 uses the e0heat pin and sensor 1
M143 H1 S285 ; Set maximum heater temperature to 285C

; Tools
M563 P0 D0 H1 ; Define tool 0
G10 P0 X0 Y0 Z0 ; Set tool 0 axis offsets
G10 P0 R0 S0 ; Set initial tool 0 active and standby temperatures to 0C

; Network
M552 S1 ; Turn network on
M550 PTEVO Little Monster ; Set machine name
M540 PBE:EF:DE:AD:FE:ED ; Set MAC address
M586 P0 S1 ; Enable HTTP
M586 P1 S0 ; Disable FTP
M586 P2 S0 ; Disable Telnet

; Fans RRF3

M950 F0 c"fan_0" Q500 ; create fan 0 on pin fan0 and set its frequency
M106 P0 C"Part Cooling fan" SO H-1 ; set fan 0 name and value. Thermostatic control is turned off
M950 F1 C"fan_1 Q500 ; create fan 1 on pin fan1 and set its frequency
M106 P1 C"Hotend fan" S1 H1 T45 ; set fan 1 name and value. Thermostatic control is turned on

M501 ; Load saved parameters from non-volatile memory

CONFIG OVERRIDE
; config-override.g file generated in response to M500 at 2020-05-01 11:26
; This is a system-generated file - do not edit
; Delta parameters
M665 L403.133:403.133:403.133 R484.183 H479.178 B175.0 X-0.427 Y0.016 Z0.000
M666 X-0.12 Y0.21 Z-0.08 A0.00 B0.00
; Heater model parameters
M307 H0 A90.0 C700.0 D10.0 S1.00 V0.0 B1
M301 H0 P10.0 I0.100 D200.0
M307 H1 A252.8 C117.8 D6.2 S1.00 V23.8 B0
M307 H2 A340.0 C140.0 D5.5 S1.00 V0.0 B0
M307 H3 A340.0 C140.0 D5.5 S1.00 V0.0 B0
M307 H4 A340.0 C140.0 D5.5 S1.00 V0.0 B0
M307 H5 A340.0 C140.0 D5.5 S1.00 V0.0 B0
M307 H6 A340.0 C140.0 D5.5 S1.00 V0.0 B0

Many thnaks for reading !!