Dr_Bluble,
I used the UF2 method.
Double click the reset button to enter bootloader mode, it shows up as a flash drive would, then drop the UF2 file in.
I got the file from the repository that the deep_sleep.ino is in from the wiki. Specifically you can find them here to match your board.
But I would still like to get down to 5µA or less in sleep. So Seeed (@Cirtic), I’m still looking forward to that rework for “early May”.
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