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Did you flash the Zigbee firmware and delete the multi-protocol add-on ?

I assume the Multiprotocol add-on has been deleted with the ZHA integration.For the Zibgee firmware, I don’t know how I should do it

See the link

Install the Silicon Labs Flasher add-on. And don’t assume the Multiprotocol add-on is deleted, check it.

Silicon Labs Flasher add-on to flash Silicon Labs based radios.

By default this add-on flashes the firmware to use Zigbee (Silicon Labs EmberZNet Zigbee stack).

NOTE: Make sure no other add-on or integration is using the radio. In particular disable the Zigbee Home Automation integration and the Silicon Labs Multiprotocol add-on.

This is the logs I get

[16:37:51] INFO: Preparing to start...
[16:37:51] INFO: Socat not enabled
[16:37:53] INFO: Starting Zigbee2MQTT...
[2024-06-06 16:37:59] info: 	z2m: Logging to console, file (filename: log.log)
[2024-06-06 16:38:00] info: 	z2m: Starting Zigbee2MQTT version 1.38.0 (commit #unknown)
[2024-06-06 16:38:00] info: 	z2m: Starting zigbee-herdsman (0.49.2)
[2024-06-06 16:38:00] warning: 	zh:ezsp: Deprecated driver 'ezsp' currently in use, 'ember' will become the officially supported EmberZNet driver in next release. If using Zigbee2MQTT see https://github.com/Koenkk/zigbee2mqtt/discussions/21462
[2024-06-06 16:38:10] error: 	zh:ezsp:uart: --> Error: Error: {"sequence":-1} after 10000ms
[2024-06-06 16:38:10] error: 	zh:ezsp:ezsp: Connection attempt 1 error: Error: Failure to connect
    at SerialDriver.resetForReconnect (/app/node_modules/zigbee-herdsman/src/adapter/ezsp/driver/ezsp.ts:347:19)
    at SerialDriver.emit (node:events:517:28)
    at /app/node_modules/zigbee-herdsman/src/adapter/ezsp/driver/uart.ts:348:22
    at Queue.execute (/app/node_modules/zigbee-herdsman/src/utils/queue.ts:35:20)
    at SerialDriver.openSerialPort (/app/node_modules/zigbee-herdsman/src/adapter/ezsp/driver/uart.ts:108:13)
    at SerialDriver.connect (/app/node_modules/zigbee-herdsman/src/adapter/ezsp/driver/uart.ts:63:13)
    at Ezsp.connect (/app/node_modules/zigbee-herdsman/src/adapter/ezsp/driver/ezsp.ts:353:17)
    at Driver.startup (/app/node_modules/zigbee-herdsman/src/adapter/ezsp/driver/driver.ts:164:13)
    at Controller.start (/app/node_modules/zigbee-herdsman/src/controller/controller.ts:127:29)
    at Zigbee.start (/app/lib/zigbee.ts:62:27)

So z2m can’t connect. Did you flash the Zigbee only firmware, and remove the multiprotocol add-on, and disable ZHA ?

Well I don’t know how to flash with the firmware…
This is the issue for sure

install this add-on

and start it

I did but I can’t select nothing as a firmware

Just select the correct serial port and it will flash the ZigBee firmware after start