Problem to pair CC2531 routers with CC2531 Coordinator

I flashed the coordinator firmware in to my CC2531 dongle (CC2531ZNP-Prod.hex).
Then I flashed the router firmware in ti my two other CC2531 dongle (router-cc2531-std.hex)
I installed last versione of zigbee2mqtt v. 1.9.0
I restarted my Hassio v. 0.104.2
In the log of zigbee2mqtt I view that coordinator was recognized…
I switched on join command
I pressed > 5 sec SW2 of CC2531 router… but it blinks one time a second and do not pair with coordinator

Any suggestion?

Try again. The last router I flashed I had to try several times.

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Try again and anjoy :wink:

have you made it work ?

The red light should blink more times in a second.

I had to push the SW2 button for 10 seconds or more… untill red keeps blinking. That is pairing-mode… When its paired it should link once per second…

Was a fix found since 2020?
I’m seeing the same problem with CC2531 routers connecting to a CC2531 coordinator in 2023!