Update to iOS 14.8 on my iPhone 6s ends in in error

It is not possible to update to iOS 14.8. The update will install iOS 15.6.1.

If your iPhone, iPad, or iPod touch won't update - Apple SupportOfficial Apple Support › en-us

Make sure that you have a good strong Wi-Fi connection. Post back if you are still having problems after working through the steps in the Apple Support document above.

Indeed. You can only update to 15.6.1 through the proper method. Where are you trying to install 14.8 from?

Can you please post a screenshot?

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That is not what will be installed if your proceed with the update. iOS 15.6.1 will be installed.

What does the error message say exactly? Alternatively, you can update your iPhone using a Mac or PC by following Update your iPhone, iPad, or iPod touch with iTunes - Apple Support.