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@trandi
Sorry guys, I've actually found the fix. One really need to add the SPI1.setup() line, and by trial and error I've discovered that the 3 below parameters are the mandatory ones:
SPI1.setup({sck:A5, miso:A6, mosi:A7});
SPI1.send([0x20,0b01000111], E3);
With them it works all the time, without it only works some times... (which is really strange :) )