Kitkat issues (4.4)

Checked on Nexus 5

1.Media content URLs does not seem to work anymore to play videos via intent, instead I use this annotation:

outputFileURL = "file://" + outputFileURL;

uri = Uri.parse(outputFileURL);

intent.setDataAndType(uri, "video/mp4");

2. Serious Wi-Fi issue, some router Frequencies  does not work.
The device connect to the router, but no Internet.
When changed to the lowest frequency  number, it worked.
Many users compiling about this issue.

3. At the first phone installation, I was stuck because the phone did not manage to finish the installation without Wi-Fi, and I had no micro Sim.
The device should be able to finish initial installation without Internet.

4. Lots of camera crashes.