well, I switched over to a RPi3! Here I don´t have these strange network problems (yet!). Also, I turned the display by 180° in the webGUI´s plugin settings. It works fine now!
Thank you so much @gvolt !
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Great it’s working! 
Do you have a TP-Link switch? Experience the same behavior with this switch.
No, my router is an Asus RT-N56U.
mmh, I dont know where I can get ver 3.x.x !?
it’s still in beta not all have plugin’s in store
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Nothing has worked for me. I give up. the Chinese screen to the drawer forever.
I have no idea about Linux. I have bought a Chinese screen and I have followed the instructions in the thread without errors.
In the end, the system has stopped working.
I have made the decision not to keep trying and not to install anything that is not directly supported (based on my knowledge and for the sake of system stability).
@cutandaweb please wait for gvolt he knows a lot about screens.
@gvolt can you help him with his screen.
http://www.lcdwiki.com/3.5inch_RPi_Display?spm=a2g0o.detail.1000023.15.58222d691XWixy&file=3.5inch_RPi_Display
@cutandaweb I think I could guide you through the installation step by step. Are you willing to make another attempt to get the screen working?
Thank you wholeheartedly. but I prefer not to try it anymore
very thanks, this is useful, resolve my problem
excuse me. I get an error when I run the following command: sudo cp tft35a-overlay.dtb / boot / overlays / Error code cp: missing destination file operand after’tft35a-overlay.dtb / boot / overlays /’ Referenced URL 3.5_inch_Volumio.pdf - Google Drive
IMHO you just need to run
sudo cp tft35a-overlay.dtb /boot/overlays/tft35a.dtbo
If you do that, you will get the following error: cp: cannot stat’tft35a-overlay.dtb’: No such file or directory
Did you download “tft35a-overlay.dtb” succesfully? If so, you need to change into the directory where “tft35a-overlay.dtb” has been saved to before you execute the provided command - or you have to give the full path to “tft35a-overlay.dtb” like:
sudo cp /path/to/tft35a-overlay.dtb /boot/overlays/tft35a.dtbo
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Before that I get the following error (sorry for linux beginners) sudo: mkdir / etc / X11 / xorg.conf.d: command not found