Doser 2.1 slave fail during soft upgrade

[whoami]

Hi my slave 2.1 fail to be recognised after unsuccessful software upgrade, is there any way to restore it ?

[Vinny]

Hello,

Yes you can recover your doser. :)

Since this is a slave D2.1, you will have to connect to your primary device and follow the "Emergency PAB-device update" steps as shown here:
https://www.aquariumcomputer.com/knowledge-base/how-to-do-emergency-updates-for-pab-devices/

Make sure you disconnect ALL PAB devices, except the doser which will be receiving the update. That doser should remain connected directly to your primary device. Do not overlook this step.

[whoami]

Thanks Vinny, it sorted