updating software on old phone

If it was an iPhone that was eligible for updates, but had been kept from automatically updating, it would be offering you the option to update.

Since it isn't, it is an iPhone 5s, 6, or 6 Plus. No updates are, or will be, available. If you need to run modern apps, it is time to replace that outdated iPhone.

The iPhone 5s came out eleven years ago and ran iOS 7.0 at the time. It got five major version updates. The iPhone 6 and 6 Plus came out ten years ago and ran iOS 8.0 at the time. They got four major version updates. These three phones only have 1 GB of RAM. All iPhones that can update past iOS 12 have more.

That would indicate you have an iPhone 6, 6 plus, or 5S.

Those devices can not run anything later than ios 12.

You can't. An unit running 12.5.7 isn't capable of 13 or above.

(255214)

How do i get to update it further mannually?

You will need a newer phone.

An iPhone 7 will run iOS 15

An iPhone 8 and X will run iOS 16

An iPhone XR and higher will run iOS 17 and iOS 18

One-stop shopping for a list of of what iOS each iPhone model can update to: https://en.wikipedia.org/wiki/List_of_iPhone_models

Go to Settings > General > About to see what model name (and iOS version) it actually has.