Latest firmware for original Kickstarter puck.js

I have a couple of original pucks. What is the latest version of the firmware I can use with them? I upgraded to v2.0.5 and was seeing some weird behaviour with the magnetometer.

With this code to log the x,y,z values:

Puck.on('mag', function(xyz) {
  console.log(xyz);
});
Puck.magOn();

I get crazy values that jump all over the place with 2v05:

{ "x": -515, "y": -515, "z": -515 }
{ "x": -9, "y": -2057, "z": -2057 }
{ "x": -129, "y": 32639, "z": 32639 }
{ "x": 0, "y": 3071, "z": -1 }
{ "x": -258, "y": -258, "z": -258 }
{ "x": -129, "y": 32639, "z": 32639 }
{ "x": 0, "y": 3071, "z": -1 }

The same code on 1v95 give sensible readings:

{ "x": -3165, "y": 757, "z": -3567 }
{ "x": -3172, "y": 759, "z": -3571 }
{ "x": -3177, "y": 761, "z": -3566 }
{ "x": -3176, "y": 762, "z": -3567 }