What is the last software can be updated for iPhone XS Max ?

johney7272 wrote:

What is the last software update of iPhone XS Max please?

iPhone XS Max is supported by the most current iOS 16, and is supported by the iOS 17 preview.

There has been no end of support announced.

iOS 16.5.1 is the current version.

Apple did have a iOS 16.5.1(a) rapid security update available, but that update has been withdrawn.

When or if iOS 16.5.1(a)—or some follow-on update—might become available, nobody here knows.

johney7272 wrote:

one more question, my iPhone XS Max is done with previous user iCloud and I don’t know what the password.

so what’s going to do with that please?

Return this to the seller for a refund, or for an unlock (an unlock which can be performed remotely), or—since you're asking this question here, and not engaging with the seller directly—recycle this iPhone.

With Activation Lock set, this iPhone will never be useful to you.

How to transfer an iPhone: What to do before you sell, give away, or trade in your iPhone or iPad - Apple Support

Every update includes important new fixes for potential internet security issues.

If you don't care about having the most up to date security for your phone......don't update.

Just remember though......when you do update.....all of the things that you skipped will be included in the update, so it might make sense to protect your phone as much as possible and apply a new update when it is available.

If you are really asking what is the most up to date software for your iPhone.....iOS 16.5.1 for now, but expect a security update in the next day or two

Nothing you can do if you cannot get a hold of the previous owner to learn the Apple ID and Password that was used for iCloud.