1. Fixed the bugs, improved the user experience on Joule mode.
2. Change the protected resistance.
3. Solved the heating problem on joule mode under very low resistance condition.
4. Screen light now does not go out after overheat warning and the countdown malfunction.
5. Fixed the gibberish problem when operating the menu on bluetooth.
6. Improve software counting method.
7. Return to main function now works after adjusting the setting on the application.