Hi am using I phone 6 .. I need to update software

An iPhone 6 isn't capable of 13 or higher, or application versions which require it. To update it to 12.5.5, follow the instructions in the Related Article above.

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That phone is obsolete. It can not run anything newer than iOS 12.5.5.

An iPhone 6 isn't capable of 13 or higher, or application versions which require it. To update it to 12.5.5, follow the instructions in the Related Article above.