I use the 3.5" NX4832K035 board.(Enhanced board)
I have some problem during the firmware upload.
If there is microSD card in the board, it starts the firmware upgrade after the reset.
And it completes the firmware upgrade.
But it doesn't restart.
I have to reconnect the power on it.
And in the seldom cases, it fails to upgrade the firmware.
At that time, I can't connect the serial port(USB-TTL).
So, I can't reboot the board by the command.
Then I have to turn off the system.
But in my case I can't turn off the system easily
I need the ladder to turn off the power switch because there is in the ceiling height.
I want to ask you to support one GPIO input to reset your system.
Or I want to ask you to support one button to reset your system in the LCD screen(microSD update screen)
I uploaded to Nextion in the Nextion Editor by using USB-TTL.
And it's OK and rebooted automatically.
If I stopped the firmware upload by force (Forced Interrupt!) during the firmware upload,
I couldn't start the firmware upload in it again.
And the LCD screen is the paused screen.
I want the firmware upload again in that case.
Or I want to ask you to support one GPIO input to reset your system.
(It maybe exist, I can't sure, because I don't have your expansion board and I didn't test it)
Or I want to ask you to support one button to reset your system in the LCD screen(Serial upload screen)