I have the same problem,
Last update done then mic stopped working. Tried changing the levels in EM mode but makes no difference. People can here a sound wave noise but thats it.. Works fine with the headphones. I have only had this phone a few days - sort this out BlackView!!! or i'm sending it back

I have the same problem. Bought new phone bv6000s last week off amazon. On thursday a requested android update and the mic stopped working, tried the engineers suggested volume adjustment but doesn't work. any ideas how to fix this.