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@Gordon, apologies for not replying initially. It all worked before and tried the above code as well and it changes the registers as intended.
This then means that the NFC pins that had stopped working as GPIO now work again which is what I was trying to prove all along.....

Will try it....

Many thanks for that. Will look at the app then. Its probably more the downloading firmware files from a remote location...

@Gordon, for clarity, why do we need to restart the "softdevice" to be able to use the poke32 functions?

You really did mean an app (not going down that route)... I've just sent someone instructions to use the URL approach but firmware zip file might change so it won't be right. the local file select function just doesn't work which is a shame. Tried it numerous times..

I'm struggling to find the link to the Nordic app to try..Must be missing the obvious

Thankyou @Gordon, that works... I've put in the extra semi-colons...

NRF.disconnect();setTimeout(function() { NRF.restart(function(){ LED.set();
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
});}, 1000);

Oh ok. I use TTL Serial devices all the time.. missed that. I'll try it but for the production pcbs this will be a pain to connect serial and override the register.

Thanks @fanoush, Am I missing something as my MDBT42Q has no USB connector?

I got the latest FW in using the ULR link as I mentioned but the write register commands aren't working for me....

@Gordon, I am really stuck here. We've got PCBs made and it was in hindsight a bad idea to use the NFC pins for straight GPIO work....

Tried that @fanoush. its not calling the code inside the restart function it appears

Here's the IDE...

Thanks for the prompt replies. I've got the zip file downloaded and selected it using the "flash from file" button. I select the correct board in the FIRMWARE UPDATE dialog, press next and then there is no prompt to put into bootloader mode...nothing else happens.
Got round that using the URL approach. firmware is in (IDE confirms that) but still can't set the register? Power cycled it as well... Tried the done var watch as suggested by @fanoush and its set still to zero so something is not working

function READNFC() {
   console.log(peek32(0x1000120c).toString(16));
  return (0);
}

function SETNFC() {
NRF.disconnect();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
});
}

Hi, I'm trying the same thing to override the NFC function on a MDBT42Q and use just as a straight GPIO. I've just upgraded the firmware to 2V08 and pasted in the code from Gordon... still getting the "ffffffff"value for that register.

Any help would be appreciated.