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Hello every one, I have a Xperia C4 (E5306)
when i turn on the portable WI-FI hotspot, the cell phone say "Tethering error" Error occurred during tethering
the same says when i turn on the "USB tethering"
My cellphone has the last up date.
Please fix it. 
rdate
Hi Hectorini50,
Welcome to the community,
Can you please boot to safemode and let us know if the issue continues.
Hello, Jake, the problem still persists in safemode 
This could be software related. I suggest you perform a software repair on the handset to help resolve this issue.
I did it, the error still persists 
Thats really unfortunate, it's possible that this could be software. I suggest contacting the customer care team directly via phone.
Use my signature below to find contact details.