New answers tagged headphone-jack
First off, you require root. Then Install Xposed Framework and Install an app ( forgot the name but do a quick google search for it and you will find it ) which lets you override your deafult actions when certain things happen like plugging in the headphone. Then you can set that action to anything you want.
This is a non-answer to close the question. In the unlikely case that an actual answer appears, I'll transfer the accept to that. No solution was found for the question as asked. By now, I doubt that anyone will ever care for that particular model of tablet, which was cheap even back when it was new. I'm still using it, as it happens, but mostly only as a ...
If your tablet has bluetooth, then a bluetooth speaker may be used in this case. It's worth a try.
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