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In ManualsFile, you can ask and answer questions about your issues. We - volunteers - or other people who own the product will help you.
You should also read the documentation for your own answers. Download documentation for this product here.
Where is the backup or exit key
It is the Previous Channel Button (Button 14 in the user manual).
https://manualsfile.com/product/bf8llwtcd.html#:~:text=14.%20Previous%20Channel
What are the codes?
You can download at https://manualsfile.com/download/bf8llwtcd/0.html Or find at https://byjasco.com/support/resource-library/ge-universal-remote-codes/cl4
If you have any questions about this product, please ask here.