BT HexLoader is a simple but powerful app. Which allows you to flash Arduino code hex file directly from your phone or tablet. It is completely free just some ads and you can do whatever you want with it.

* No In-App purchases or pro version
* All features unlocked by default
* Works without any modification in your arduino
* Simple and easy to use


**********Steps to be performed*******

1. Create a hex file of your code from your pc (To do this go to sketch > Export Compiled Binary)
2. Transfer hex file which name contains bootloader
3. Now open app and press browse button and choose hex file from device.
4. Now press send button and it will show you paired devices, choose from it.
5. Now press reset button on arduino
6. Wait for on screen message saying "Connected" then leave button immediately and your board should be flashed, you will get a success message.


Note : Just make sure you are pressing reset button at correct time.