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nextion 4.3 enhanced problems


 Hi. I just bought me a nextion 4.3 enhanced. I connected it to an arduino mega and uploaded my file to the nextion. Im Having 2 problem

1. im struggling to communicate through the serial port. I did config the nexconfig file  and added it to my sketch but still no success

2. while figuring out the code and why it wont work through the serial port i left the screen connected to the arduino mega (using the 5v and Gnd). I disconnected the usb to the board and reconnected it and the screen never went back on.

I then tested and confirm the 5v to the screen and there is 5v.

I tried uploading my file to the screen and it successfully uploads but still no display

i am a newbie to this any help will be appreciated

Thank you
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