Sorry for writing in english. I read german, but I'm out of practice writing it.
For a few days, my 4.2 has been crashing periodically. Typically while playing music, taking a photo, writing an email or using some other app. The screen freezes, and then blacks out after a minute or so...
I have experienced the same problem, after flashing my 4.2.
I solved it using the guide here:
(he has a very strong indian accent, turn on subtitles).
I have the exact same problem. The issue doesn't seem to be that there is no GPS signal, but that it is highly inaccurate. Particularly when driving by car, my position jumps randomly back and forth within a 100 meter radius from where I actually am. Highly confusing and potentially dangerous. I...
After flashing, my 4.2 is unresponsive as a brick.
The phone froze while downloading some mp3 files to the phone. I tried to remove the battery and reboot. It booted, but froze again with just a shift logo on the screen.
I tried to do a factory reset, but this did not help. The phone still...
Sorry for replying in english - I read german, but I'm not very good at writing it.
I don't know about the first part of your question, but you need to unpack the file (SHIFT4.2.LAD.V00.20170525.rar) before flashing. Use Winrar https://www.rarlab.com/download.htm or similar.