LS990 efs drop ... help.

Friends, I need help LS990 :(
With firmware phone is switched off the electricity and the computer is turned off.

• EFS, imei, serial, gps, Baseband unknown - no

• wifi, Bluetooth - working

Firmware phone again brought no result.

[Q] Network Drop Problem

Occasionally, during a call, the call will get disconnected and the network for the sim that was in call would get switched off, followed by the other sim. Toggling airplane mode brings back the network. This was more prevalent in MIUI, and after switching to CM12.1, it has become less frequent. Does anyone else have this issue?

Weird streak under the glass after drop

Hello, I need some advice regarding a strange hardware issue in my 2012 Wi-Fi only Nexus 7.

I dropped it onto a hardwood floor a few months ago and there has been a streak of air under the left side of the glass ever since. Otherwise everything works perfectly.

Link to the image: i.imgur.com/8tDE2ik.jpg?2

The line seems to be a gap of air under the glass, its color changes a little if I press it down. Does anyone have any ideas on how to fix it?