Try ebay. Maybe in different countries. I found often so.e out there.

You decision is fully fine! No brand is nesessary to prefer, just maybe silicone wire since it is much more easy to solder for beginners. I suggest all signal wires to be twisted to its pair: USB, Audio and Video. Button wires and power do not nead to have this twisting.

It will jist not work. Reason: two totally different protocols.

Hi,

Since Yaya or how he was called here is not available anymore with his decals: is anyone else able and willing to produce and sell some of these nice decals looking simelar to the original ones?

Are you sure about your PIs IP adress: usually I see something like 192.168.xxx.xxx that is provided from router DHCP to the pi.

我不知道你在说什么

You should try to reload the raspberry image.
Or: use another SD card
Or: did you changed any overclocking settings inside of config.txt?
This could be at worst a faulty raspberry!

One way could be:
-power the board by 12V.
-measure on which inductor you get 5V to ground.
-one this point you inject your 5V finally.

From my point of view necessary since it looks much better to have the screen flat to the case surface. Without it looks not nice and on top as usual the screen is protected against scratches.

This should work with KEDEI screen but its better to set to its native resolution in order to save power. Otherwise the screen board needs to convert the resolution internally. For the 3.5 inch KEDEI screen I used this setting: dmi_force_hotplug=1 hdmi_group=2 hdmi_mode=87 hdmi_cvt 480 320 60 6 0 0 ...