Hi
It seems that there is a tool which slides down above and below those strips.
Unfortunately I don't posses such a tool but have discovered that four steak knives do the same job!
Many thanks for your help.

Hi
I cant see any holes to insert removal tools

Images are here
https://goo.gl/photos/gv8nVWggfmYBER287
https://goo.gl/photos/5kzaMPQqDSHhSc9v7

Many thanks

Hi
Thanks for your reply.
I don't understand what you mean.
I am struggling to remove the existing sat nav.

Hi
My Bongo has the original Japanese radio and separate sat nav NAX9200.
The radio came out easily but I cant see how the sat nav unit can be released.
Any ideas gratefully received