The sound is not working

I bought a Hi10X tablet with keyboard and I was updated I have windows 10 and the sound has stopped working. I have read all the messages of the chuwi forums installed drivers and I can hear the sound if I connect some headphones but if I remove them an x appears in the sound sign and I do not hear anything.
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modelo 10XEW1H211101557

I sent an email to Chuwi and nobody has answered me.
Is it working in Windows 10?.
Because I tried in Windows 10 and isnt working too.