I use es file explorer. In the left side expand tools and turn root explorer on. With the app root explorer there's a mount rw button for read/write operation, default is ro read only.




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Quote from: matt on October 14, 2014, 08:28:30 PM

if you enable backup, then root, then check restore when setting it up again, the WiFi passwords should be there.

Thanks Matt--
Please let me know if the following plan of action sounds correct and complete to you.
On my Nexus7 (2012) I have enabled backup to the Google servers and also restore. It allows developer mode and USB connection.  It runs KitKat 4.4.4
I am planning to use the WugFresh Nexus Root Toolkit 1.8.8, as the interface seems understandable to a newbie like me.

1.  I download NRT_v1.8.8.sfx.exe to my Windows Vista computer and run it to install the Toolkit.
√
2.  Since the Vista computer already runs Android SDK (which includes ADB and Fastboot) and connects to the Nexus7, I assume I won't have to install any drivers.  But anyway WugFresh Toolkit seems to have a Step 3 that will test the drivers.
Not sure of vista, due to usb updates, I'd upgrade to 7, but √
3.  I'm not going to backup anything to the PC, because the only file I want to save is presumably on the Google backup server.
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4.  I connect the Nexus7 by USB and push the "Unlock" button in WugFresh Toolkit.
Test drivers first. You're dealing with chip set and windows USB functionality as well as correct? adb drivers and quality of USB cable. Of the 5 ports on my laptop, only one works correctly for adb.
5.  I click the "custom recovery" box (I don't understand why) and push the WugFresh Toolkit button "Root".
The recovery is needed to flash new su binaries to system.





After following instructions, I restart the Nexus7 and enter my account information and ask to restore my files from the Google server.  I am unclear whether there will now be PlayStore apps on my Nexus7 again -- I don't really want them.
Probably, delete them.
6.  One of my apps already is SuperSU (but of course it doesn't do anything right now because my Nexus7 has not been rooted).  I install and run SuperSU (I don't understand this either).
It is the gateway to root access, you may need to update binaries within the app to get it working right. Su = Linux command to switch user, with no other parameters it defaults to root user.

7.  Then, if necessary, I uninstall apps I don't want, and I reinstall apps I want plus other apps that work on a rooted Nexus7.
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8.  Now I will be able to find the file I want, which is said to be in /data/misc/wifi, and I can save it somewhere.
√

As long as you don't recheck the backup option, the old dataset for that device will still be on the server. Every time you uncheck it deletes the old backup. Goto settings, your accounts, google, and enable all the syncs to ensure backups.You may need to let it restore for quite some time during setup. Depending on number of apps installed.

As long as the backup set for that device isn't erased, it may be possible to retrieve it manually with adb bmgr command, should something fail.

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If it doesn't, there is a method to use adb bmgr on the rooted device to restore from the google backup set of the other.

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That file seems to store all the WiFi passwords, under system settings/ backup and restore, there is an option to backup WiFi passwords to Google's servers.

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Okay, I just tried on 2 jellybean devices. Hold down your finger on the pic until the blue bar appears up top. If there is no trash can icon press the vertical 3 dots upper right corner. From drop list press delete.

If it still doesn't work, factory reset. Or if rooted clear dalvik cache. (All the apps are optimized to run on your hardware and put there as Dex files)

2nd option, use a file explorer to delete them.

If the pics are synced from g+ or picassa you'll need to delete them from those apps.

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I did run into the same prob on another site, but was able to navigate through a number of screens to delete old uploaded files from my account. There was an upload limit for each user as well as size restrictions. Couldn't find that option for the web version of this forum.

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Look under sdcard/data/misc/WiFi with file explorer? The data folder under root directory is empty on mine. You should be able to read and copy but not write to protected folders.

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