I own a Wiko Rainbow with Android 4.2.2. Out of the blue my MicroSD card got locked and I can neither create nor delete any files on my phone (such as photos). At first, I did not even understand why, until I checked the file permissions in the AndroZip file manager. All files and folders have been set to read-only.
I tried restarting my phone, but nothing changed. I also unmounted and reattached the MicroSD card in the Android settings. I opened my phone, removed and checked the card, but it did not help. The card has no mechanical write lock.
How come that Android locks my MicroSD card? I did not install any new software, my phone is unrooted and all I do is update my apps occasionally. I read that Android 4.4 had some issues with memory cards. Did Google maybe lock the MicroSD card with an update?
How can I fix the problem and make the card writable again (and prevent future locks). I do not own any MicroSD card reader, so the only solution is creating a backup of the card's content and reformatting it in Android, right?
Do Android or my apps store any data on the SD card (such as user settings or contacts)?