I contacted Humax and asked them how do I open up an Aura remote control. After getting a reply from Humax suggesting I should change the batteries, reset to factory defaults and change to RF setting I again asked for details on opening up the remote as I had already changed the batteries and to RF, This is their response
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" If you decide to proceed with opening the remote, we recommend searching for instructional videos on platforms like YouTube. While there may not be an exact guide for the Humax Aura remote, similar videos for other remotes should provide useful insights.
However, please be aware that proceeding in this manner carries some risk, and we cannot guarantee success or the continued functionality of the remote. Please remember that any actions taken are at your own discretion, and we cannot be held responsible for any damages that may occur.
Alternatively, you may consider purchasing a new Aura remote from our website. Unfortunately, it's currently out of stock, but you can keep an eye on the product page for updates:
https://www.humaxdirect.co.uk/accessories/humax-aura-rm-c01-freeview-play-remote.html"
A search on YT gave me this, Not exactly inspiring, best to keep some glue handy