When will come update for version in my i phone 6 plus?

Unfortunately, the iPhone 6 Plus is not compatible with iOS 13 or higher.

It can be updated to iOS 12.5.6, no further.

12.5.6 is out now. If you're referring to 13 or above, it won't; Apple couldn't get it to work at a reasonable speed if at all.

Nobody on these boards will know about future updates to 12.

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