Confirmed from Standard Horizon UK tech support it is the US firmware update that caused my issue. Applying the US firmware removed the ability to select UK in the radio setup screens, and channels M / M2 are UK only channels.
However, there is a "secret" way to fix it:
- Switch radio off
- Hold down MENU & 16/S buttons whilst powering radio on
- When it boots, select UK, OK etc.
- Radio will restart.
Of note, I have two of these radios, and the above procedure worked for one of them, and not other. So the one that remains "broken" is being returned under warranty.
F*****g yanks !
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