avrdude: stk500_recv(): programmer is not responding

[RT36 8]

Bonjour à tous & à toutes,

ça fait un moment que je n'arrive pas à flasher (pour activer le mess bed leveling) une Ender 3 Pro (carte mère Creality 1.1.5) ... mais, quoi que je fasse, j'ai toujours la même erreur avrdude: stk500_recv(): programmer is not responding

bref, je ne sais plus quoi faire, donc si vous avez une solution, n'hésitez pas  merci d'avance ...

Verbose mode can be enabled via `-v, --verbose` option
CONFIGURATION: https://docs.platformio.org/page/boards/atmelavr/sanguino_atmega1284p.html
PLATFORM: Atmel AVR (3.1.0) > Sanguino ATmega1284p (16MHz)
HARDWARE: ATMEGA1284P 16MHz, 16KB RAM, 124KB Flash
DEBUG: Current (simavr) On-board (simavr)
PACKAGES: 
 - framework-arduino-avr 5.1.0 
 - tool-avrdude 1.60300.200527 (6.3.0) 
 - toolchain-atmelavr 1.50400.190710 (5.4.0)
Converting Marlin.ino
LDF: Library Dependency Finder -> http://bit.ly/configure-pio-ldf
LDF Modes: Finder ~ chain, Compatibility ~ soft
Found 6 compatible libraries
Scanning dependencies...
Dependency Graph
|-- <U8glib-HAL> 0.4.3
|   |-- <Wire> 1.0
|   |-- <SPI> 1.0
|-- <Wire> 1.0
|-- <SPI> 1.0
|-- <EEPROM> 2.0
|-- <SoftwareSerial> 1.0
Building in release mode
Checking size .pio/build/melzi_optimized/firmware.elf
Advanced Memory Usage is available via "PlatformIO Home > Project Inspect"
RAM:   [===       ]  28.5% (used 4670 bytes from 16384 bytes)
Flash: [==========]  99.0% (used 125752 bytes from 126976 bytes)
Configuring upload protocol...
AVAILABLE: arduino
CURRENT: upload_protocol = arduino
Looking for upload port...
Auto-detected: /dev/cu.usbserial-1410
Uploading .pio/build/melzi_optimized/firmware.hex
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x67
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0xda
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x0d
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0xd6
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0xf6
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x0a
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0xd6
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0xfe
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x67

avrdude done.  Thank you.

*** [upload] Error 1
================================== [FAILED] Took 17.28 seconds ==================================

Environment      Status    Duration
---------------  --------  ------------
melzi_optimized  FAILED    00:00:17.280