I have i phone 6 plus with 16 gb internal storage and i am using ios 12.5.5 now i want to new update ios 13 or 14 help me to update my i phone

Sorry, the iPhone 6 Plus can not be updated beyond iOS 12.5.5.

Please if I want to upgrade my iPhone 6 that is iOS 12 to iOS 13 how can I do it please???

You can't.

Iwat to update my iPhone

You can’t , iPhone 6 Plus and power models can’t get update to newer iOS versions

I have tried using beta.apple.com to get iOS 15 but when I open my iPhone 6 Plus it says it is up to date meanwhile it is still 12.5.5

please help me to update to iOS 13 or 15

Thank you

Not possible. This is the 4th time you have been told a fact that will not change.