[Galaxy S III Q&A, Help & Troubleshooting] XDA Visitor:
This is happening to me. Any help on how to set interneal memory to read and write. i cannot save any file to my phone from any apps.

I'll apreciate your help.

"Let me first apologize for the length of this but hopefully someone will be able to help. I have a Sprint Samsung Galaxy S3 SPH-L710 running 4.4.2. I recently attempted to use CMInstaller to load Cyanogenmod (I use otter1 on my Kindle and love Cyanogenmod and I really dislike Samsung's OS and bloatware) but it failed. It would get to the point of "Loading OS" and then the android picture on my phone was laying flat with a red triangle over its chest (I'm guessing that means error). CMInstaller then completed and said everything was successful. My S3 then gave me two yes/no questions but no matter what I answered, it eventually just returned to the stock Samsung OS with no root or superuser. From what I have been reading, this is due to Knox and I need to root my phone and remove Knox. I've found several helpful forums on xda-developers on rooting my phone and deleting Knox.

My issue though is that apparently somehow my phone's internal memory has been set to "read-only" or affected in some other way. The phone still works as a phone and it has allowed me to install apps and I can transfer files to and from both the internal memory and the SD card using my computer. But I've noticed that some apps are acting very strangely.

Amazon Kindle: will not download any books or register that I transferred ebooks to the Kindle folder (and yes, they are in the right folder and the right formats). When I attempt to download a book, the pull down menu for the phone gives me an error of "N/A - Download unsuccessful. Tap to try again." When I tap on that, it goes to a download screen that just sits there and does nothing. If I click on the book in the Kindle app it gives me an error of "Unable to Download. A network connection is required to download your Kindle title. Please connect to a network and try again." During these errors I have network connection (I am able to get online using the Dolphin browser) and have tried multiple different wifi networks and Sprint's network in many different geographical locations. I have tried using my wife's Amazon account on my phone with the exact same result.

Dolphin browser: Will not download anything to the internal memory (immediately results in a "Download unsuccessful") and fails to recognize my external SD card (when attempting to choose it as a download location it displays the message "Can't find file or directory. Please make sure your SD card is ready, and USB Mass Storage is turned off.") My phone is not connected to my computer during this.

Google Drive: Immediately fails to download any file.

doubleTwist: When attempting to set the music location to internal memory, doubleTwist says "It appears that your device has been set to read-only." Can access the SD card and play music found there.

All of the stock Samsung applications can access both internal memory and the SD card with no problem. The camera can save pictures to the internal memory and the SD card, the stock browser can save files with no problems, the voice recorder can record and save without issue and My Files can move, copy and delete files on both the SD card and the internal memory. It could argued that I just use Samsung's apps but I hate Samsung's apps and most of the time there are all hidden/disabled.

All of this started after CMInstaller failed. Is there any way to fix this? More importantly will this stop me from (or mess up) rooting my phone, obliterating Knox and loading Cyanogenmod? Part of me just wants to leave the phone as is since it still works (for the most part) but another, bigger part of me wants to remove Samsung's hold on my phone even more than before."