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OTG SD-card unmounts automatically
I got an OTG USB/card reader for my S4 (9505) in October. Worked great, could transfer files between an SD card and my phone.
Updated from 4.2 to 4.3 in December. Thought I tested everything worked but apparently not, because when now when I plug it in it detects it but I immediately get the message "USB mass storage safely removed". Don't know if the update is the cause but it's the most significant change to my phone that I can think of.
Under Settings > More > Storage, the option is there to mount OTG storage, but selecting it does nothing. I've tried various OTG diagnostic/checking apps, they can all detect it, even that I'm using a 16 GB SD card with it. But I can't actually use the 'darn' thing.
Any suggestions would be greatly appreciated. Phone is not rooted. I'm currently away from home so I wouldn't be able to make use of a solution that needs a PC . This is also why I need this device to work - to back up my photos from my (non-phone) camera because I have no other way.
Incase it's relevant:
Thanks in advance.