I am an eBay camera seller.  I have used a pair of Sony a6000 Mirrorless digitals for my listing photos.  

I got this about 5 years ago.  It did have a shutter error 4 years back and I got it serviced, then I put it away and used my gray model.

The error:  "Turn off and back on" message has come back.  

No battery, no returns accepted on this.

You may already have repair skills, I am too old to see small parts.