[brusselssprouts]

I do, their SDK is OK... but Nordic is the clear leader on tooling and SDK quality. The DA14531 has OTP memory for the final firmware and you can program and run out of RAM for testing. The firmware is typically mirrored to RAM anyway so this is pretty much indentical to how it works after programmed.

[foldr]

Oh, interesting. I had assumed that the usual dev setup would involve external flash rather than running the code from RAM. That sounds quite a bit easier. It seems like Nordic is the way to go unless you really need to shave every cent off your BOM cost. Thanks for responding.