Flashing PineTime with 3rd party bootloader

[Mpoint]

Since both pineTime and banglejs use has the same hardware chipset Would it be possible to flash bootloader.js to by converting javascript to binary https://stackoverflow.com/questions/1443...han-base64

Alternatively I am looking for HR and HRV App for PineTime
and Banglejs has one on github 
https://github.com/jabituyaben/Espruino-HRV

[barray]

Since both pineTime and banglejs use has the same hardware chipset

The controller might be the same, but absolutely everything else looks different: https://www.espruino.com/Bangle.js

The PineTime does not have a Magnetometer, tonnes of buttons, GPS, etc. That firmware will not work out of the box.

Would it be possible to flash bootloader.js to by converting javascript to binary https://stackoverflow.com/questions/1443...han-base64

BASE64 is not binary, it's simply an encoding. The watch has no way of processing Javascript without being told how to.

Alternatively I am looking for HR and HRV App for PineTime
and Banglejs has one on github 
https://github.com/jabituyaben/Espruino-HRV

The current PineTime firmware can read the HR sensor. It's unclear to me what is required to calculate HRV though. It mya not be possible with the current hardware.

[wibble]

The github readme describes the method used to calculate HRV from the heart rate sensor data, so I think it could be implemented with the existing hardware.