Zigbee2mqtt configuration

You did add rtscts: true already to serial ?

And 7.4.1 is known to be buggy.

This is 8.0.2:

https://github.com/Nerivec/silabs-firmware-builder/releases/download/v2024.6.2-update7/smlight_slzb07_zigbee_ncp_8.0.2.0_115200_hw_flow.gbl

my problem is solved and zigbee2mqtt is running

Firmware updated
Config File change to :

mqtt:
  server: mqtt://core-mosquitto:1883
  base_topic: zigbee2mqtt
  version: 5
# Serial settings
serial:
  port: /dev/ttyUSB0
  adapter: zstack
# Set output power to max 20
advanced:
  transmit_power: 20
  channel: 11
  pan_id: GENERATE
  network_key: GENERATE
  availability_blocklist: []
  availability_passlist: []
  last_seen: ISO_8601
  log_level: info
homeassistant:
  enabled: true
  legacy_action_sensor: true
  experimental_event_entities: false
permit_join: false
devices:
  - devices.yaml
groups:
  - groups.yaml
it may help anyone in my situation and thanks for your support

The adapter was changed to ember

You have a SLZB-07 with TI chipset ? Never seen before

https://smlight.tech/product/slzb-07/

or do you have a SLZB-07p7 ?

https://smlight.tech/product/slzb-07p7/