Help with SSD1327 OLED display

No, I don't print it.
I'm running 2v19 which I flashed on it using this command:

python "../esptool/esptool.py" --port COM6 --baud 115200 write_flash --flash_freq 80m --flash_mode qio --flash_size detect 0x0000 espruino_2v19_esp8266_4mb_combined_4096.­bin

I now downloaded a cutting edge build from here: https://www.espruino.com/binaries/travis­/master/espruino_2v19.99_esp8266_4mb.tgz­
and installed it with the following command:

python "../esptool/esptool.py" --port COM6 --baud 115200 write_flash --flash_freq 80m --flash_mode qio --flash_size 4MB-c1 0x0000 "boot_v1.6.bin" 0x1000 espruino_esp8266_user1.bin 0x3FC000 esp_init_data_default.bin 0x3FE000 blank.bin

However I get the same problem.
I modified my code a bit to "work" without the screen (just commenting all the writeTo calls):

var exports={};
var C = {
 OLED_WIDTH                 : 128,
 OLED_CHAR                  : 0x40,
 OLED_CHUNK                 : 128
};
// commands sent when initialising the display
var initCmds = new Uint8Array([
             0xAE,       // 0 Display off (all pixels off)
             0xA0, 0x53, // 1 Segment remap (com split, com remap, nibble remap, column remap)
             0xA1, 0x00, // 3 Display start line
             0xA2, 0x00, // 5 Display offset
             0xA4,       // 7 Regular display
             0xA8, 0x7F, // 8 Set multiplex ratio: 127
             0xB3, 0x00, // 10 Front clock divider: 0, Fosc: 0
             0xAB, 0x01, // 12 Enable internal Vdd
             0xB1, 0xF1, // 14 Set phase periods - 1: 1 clk, 2: 15 clks
             0xBC, 0x08, // 16 Pre-charge voltage: Vcomh
             0xBE, 0x07, // 18 COM deselect voltage level: 0.86 x Vcc
             0xD5, 0x62, // 20 Enable 2nd pre-charge
             0xB6, 0x0F, // 22 2nd Pre-charge period: 15 clks
             0xA4, // 24 normal display
             0xAF, // 25 display on 
            ]);

// commands sent when sending data to the display
var flipCmds = [
     0x15,// columns
     0, C.OLED_WIDTH - 1,
     0x75, // rows
     0, 127
];

function update(options) {
  //TODO
}

exports.connect = function(i2c, callback, options) {
  update(options);
  var oled = Graphics.createArrayBuffer(C.OLED_WIDTH,­128,4);

  var addr = 0x3C;
  if(options) {
    if (options.address) addr = options.address;  
    // reset display if 'rst' is part of options 
    if (options.rst) digitalPulse(options.rst, 0, 10); 
  }
  
  setTimeout(function() {
    // configure the OLED
    //initCmds.forEach(function(d) {i2c.writeTo(addr, [0,d]);});
  }, 50);

  // write to the screen
  oled.flip = function() { 
    // set how the data is to be sent (whole screen)
    //i2c.writeTo(addr, [0].concat(flipCmds));
    setTimeout(function() {
      flipCmds.forEach(function(d) {/*i2c.writeTo(addr, [0,d]);*/});
    }, 50);
    
    setTimeout(function() {
      var chunk = new Uint8Array(C.OLED_CHUNK+1);
      chunk[0] = C.OLED_CHAR;

      for (var p=0; p<this.buffer.length; p+=C.OLED_CHUNK) {
        chunk.set(new Uint8Array(this.buffer,p,128), 1);
        //i2c.writeTo(addr, chunk);
      } 
      //print("flip runs");
    }.bind(this), 100); //wait for flipcmds to run
  };
    
  // set contrast, 0..255
  oled.setContrast = function(c) { /*i2c.writeTo(addr, 0, 0x81, c);*/ };

  // set off
  oled.off = function() { /*i2c.writeTo(addr, 0, 0xAE);*/ };

  // set on
  oled.on = function() { /*i2c.writeTo(addr, 0, 0xAF);*/ };

  // if there is a callback, call it now(ish)
  if (callback !== undefined) setTimeout(callback, 100); //TODO test
  
  // return graphics
  return oled;
};


function start(){
  print("this runs");
  g.clear();
  g.setContrast(128);
  g.setColor(1);
  g.drawString("Hello world 123!",32,32);
  g.drawRect(0,0, 127, 127);
  g.flip(); 
}

I2C1.setup({scl:D5,sda:D4,bitrate:400000­});
var g = exports.connect(I2C1, start); 

Flashing this returns "this runs", but if I then run start() manually from the left side, it returns the following:

>start();
this runs
=undefined
>F 15
F 15
F 15
F 17
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0
F 0