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@Gordon
I just tried here with some I had kicking around on older firmwares (1.69/71/78) and upgraded them - and it does still seem to work for me when sending from the Pico using your code (albeit with the CSN/SE pins changed to how I had things wired).
Does it work at all for you?
I did manage to get a TX not received to start happening after a while, but unplugging/replugging fixed that for me (and I think that's the classic capacitor issue because I haven't installed any on mine).
I was getting
TX not receivedall the time and I thought I'd reproduced it, but it turned out I had the wrong IO pins set up :)