2

My phone is a stock Nexus 4 from Google with the 5.0.1 Lollipop image from Google.

I've mistakenly hit "reset APN settings". Instead of resetting them to defaults, it wiped them off and grayed out the "add access point" button. I don't know what to do to gain access to this back.

I've tried launching the "Settings" activity from the terminal with root access (using the "su" command), see this answer, but the "Settings" activity crashes right after its launch.

What can I do? There seems to be a user permission problem. I'm using the only user account configured on this phone, besides the "guest" user.

Improve this question
2
  • Would factory resetting the phone be a viable option for you (losing all data in the process)?
    – Chahk
    Commented Dec 31, 2014 at 16:48
  • Rather not. And it wouldn't guarantee this not happening again anyway, because the phone was freshly reinstalled when I lost this permission.
    – Cutter
    Commented Jan 1, 2015 at 13:18

1 Answer 1

Reset to default
1

I've found the problem: I had bad permissions on various MMS-related files that I've copied from a backup, especially inside data/data/com.android.providers.telephony/databases/.

Files inside data/data/com.android.providers.telephony/ have to belong to the radio group and be owned by the radio user. CHMOD has to be at least 761.

Improve this answer
5
  • So how did you fix the permissions problem ?
    – lnxnubie
    Commented May 6, 2015 at 10:16
  • IIRC files inside data/data/com.android.providers.telephony/ have to belong to the radio group.
    – Cutter
    Commented May 6, 2015 at 10:28
  • 1
    This didn't work for me. When I changed permissions in the telephony directory to 660 from 751 and rebooted I got non-stop com.android. phone error messages
    – raphael
    Commented Jun 21, 2015 at 15:54
  • Try 761, don't downgrade any permission
    – Cutter
    Commented Jun 22, 2015 at 20:14
  • I encountered a different solution, as this didn't work for me. I wrote it up on this related post
    – Hendy
    Commented Sep 22, 2015 at 14:44

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .