Espruine Flag Raiser app with Puck

Hello!
TLDR: Is Flag Raiser app supposed to work with the Puck v2?

I got Web BT working with my Puck.js v2 (i.e send LED on/off code when clicking on buttons in Chromium).

I would like to do the same from Bangle.js so I picked Flag Raiser app to modify it (it was doing nothing to the puck).

I looked at Web BT puck.js library and it seems to have different service GUIDS
var NORDIC_SERVICE = "6e400001-b5a3-f393-e0a9-e50e24dcca9e";
var NORDIC_TX = "6e400002-b5a3-f393-e0a9-e50e24dcca9e";
var NORDIC_RX = "6e400003-b5a3-f393-e0a9-e50e24dcca9e";
but when I change Flag Raiser code and use the new address then

Uncaught Error: Function "" not found!
 at line 17 col 611
...Done!");busy=false;redraw();}).catch(function(e){console.log("ERROR",e);bus...
                                             ^
in function called from system
Uncaught Error: Unhandled promise rejection: No device found matching filters
>

What does that mean? Tips? Suggestions?
M