Thanks for the update.
Please send me a PM with your Roku account email address, and include the serial number/device ID on the Roku device along with a summary of the issue you are experiencing. I'll be able to assist you further from there.
The volume control started working again last Thursday. I am assuming there was a bug fix or patch put in? I had not tried anything for several days.
Again, I've done everything recommended by you and on the site. Nothing worked. I will not ever buy or recommend your products again. I'm done!