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Re: I cannot delete files from external sd card
Hmmm. That wasn't clear from the original post. Now, as I recall, those issues did not exist then and came in with Kit Kat. So, now it's more complicated. On occasion over the years I have had a card lock up because of formatting issues or corruption. It could just be a bad card.
Originally Posted by marios1441
There have also been occasional reports of hardware defects in card slots of phones.
You can test both of those easily enough. Put the card in a card reader on your desktop or laptop computer. Does it work? If so, the problem is the phone (or at least the relationship between phone and card). Also, if the computer reports the card is locked and protected, can you right click on the properties of the drive icon on your desktop and unprotect it from your computer? From the computer you can also run various disk utilities to scan for defects.
Might be simpler to start here. Put another card in the phone. Does it work? If so, the problem appears to be the 1st card, or at least something done to it.
If you have no data of any value on it, the first thing you might try is formatting the card on the phone, too. That often works wonders. That may fix some incompatibility. If you do have valuable data--you may need to run a card recovery program to try to recover data, like cardrecovery.com