Arduino UNO and Nextion

Dear jose
I dont know what is wrong i tried different Uno and i have still same result both of the uno are clon model maybe it causes may be not but i tried softwareseril example and i saw only 57600 bounrate is workin g only in 4800 or 9600 i didnt write anything on serial monitor
i didnt know what is wrong

the last code I send you does not need a library. Could you send me the files that you use both arduino and nextion to test them?

Dear Jose I borrow mega from my friend and I connected Nextion Rx2,Tx2 pins and I attched the putty screenshot I think arduino send data but nextion doesnt receive

Yes, I imagined it, because the plot put on the other day that the arduino sent is correct.

  but if you have a serial port on the pc, you can send it from the editor commands. If it does not work, the screen is defective.