I have used that guide to successfully upgrade my Osram devices a few weeks ago.
When using Hassio you can use the steps below to upload the OTAU files to the Deconz add-on, so you can easily select the file in step 5b of the instruction:
- Download the OTAU file as mentioned in step 4.
- Copy the file to your Hassio
share
folder. - Use the SSH & Web Terminal add-on to SSH into Hassio.
- Run this command to copy the OTAU file to the Deconz addon
docker cp /share/ZLL_MK_0x01020510_CLA60_W_CLEAR.ota addon_core_deconz:/data/otau/
where ZLL_MK_0x01020510_CLA60_W_CLEAR.ota
is an example of an OTAU filename.