Bangle.js App Loader returns "Upload failed, Unexpected response"

I have used 2v08.117. My code:

NRF.restart(function(){
poke32(0x4001e504,1);while(!peek32(0x4001e400)); // enable flash writing
poke32(0x10001014,0x7A000);while(!peek32(0x4001e400)); // set bootloader address 
poke32(0x10001018,0x7E000);while(!peek32(0x4001e400)); // set mbr settings
poke32(0x10001200,21);while(!peek32(0x4001e400)); // enable reset pin 21
poke32(0x10001204,21);while(!peek32(0x4001e400)); // confirm reset pin
poke32(0x1000120c,0xfffffffe);while(!peek32(0x4001e400)); // NFC pins as GPIO
poke32(0x4001e504, 0);while(!peek32(0x4001e400)); // disable flash writing
});
NRF.restart();

The code

peek32(0x10001204).toString(16) 

returns 15.

There seems to be a timeout on jshflashwrite which is displayed after a reconnect to IDE.