Using pins D9 & D10 on the MDBT42Q

If you haven't sorted this, any chance you could try this code:

NRF.disconnect();setTimeout(function() { NRF.restart(function(){
poke32(0x4001e504,1);while(!peek32(0x400­1e400)); // enable flash writing
poke32(0x1000120c,0xfffffffe);while(!pee­k32(0x4001e400)); // NFC pins as GPIO
poke32(0x4001e504, 0);while(!peek32(0x4001e400)); // disable flash writing
}) }, 2000);

It might be the timeout helps since it's possible the board hadn't disconnected right after NRF.disconnect was called.