Thanks for the post.
Please contact your TV's manufacturer directly to report this issue and request additional support. Each Roku TV manufacturer provides direct support and warranty services for their products running the Roku OS.
If you need a replacement remote for a Roku TV, you would need to contact your TV manufacturer. You can contact Onn here: http://onntvsupport.com/#product_support-2 or at 1-844-334-2355.
You can also purchase a remote that is compatible with your Roku TV here: https://www.roku.com/products/accessories/roku-tv
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