Bluetooth remote paired but can't edit keys

Hi all,

Recently bought this remote on Amazon.
https://a.co/d/djkPbSU

I can pair it to my PocketBook Era. But when trying to change the key mappings, the device doesn't open the menu to do so.

I have tried from the bluetooth menu, and the specific key mapping menu. The screen flashes and nothing happens

The device shows with a ? In the bluetooth menu and UHID.

I can confirm the device uses the HID bluetooth profile. The amazon page says it uses v4 bluetooth

Any advice?

Attached Thumbnails