What if I have iPad mini 2 ,how to update it to the latest version if ipadOS?

That is never going to happen.

Your year and model iPad is nearly 10-years old.

It is too old and forever stuck on some point version of iOS 12.

Sorry.

You need to consider that it is 2023, now.

iPadOS 16.5.1 is here. Soon to come iPadOS 17.

These nearly 9 to 10-year old, iOS 12 iPad models are coming to the full end of their support life.

These iPad models will be 4 OS iterations behind, now.Soon to be 5 iterations of iOS/iPadOS behind.

You really need to seriously consider a purchase of a new iPad model OR a much, MUCH “newer” and less expensive, refurbished or used iPad models, from better known, trusted sources, like other Apple product/device retailers/resellers, some locally or from online, on the Web/Internet, capable of running the latest iPadOS versions.

There are PLENTY of newer, older iPad models that can run the latest, current versions of iPadOS.

If you need OR ONLY able to afford to purchase older, less expensive iPad models, look at older IPads from 2015 and later.

All of these older model iPads below CAN, currently, run the latest releases of iPadOS 16 AND the up and coming iPadOS 17.

2017, 12.9 inch screen iPad Pro models ( 1st gen Pencil support )

2017, 10.5 inch screen iPad Pro models ( 1st gen Pencil support )

2018 11 inch or 12.9 inch screen iPad Pro models ( 2nd gen Pencil support )

2020 11 inch or 12.9 inch screen iPad Pro models ( 2nd gen Pencil support )

2017, 9.7 inch screen iPad 5th gen models ( NO Pencil support ) (up and coming iPadOS 17 NOT supported )

2018, 9.7 inch screen iPad 6th gen models ( 1st gen Pencil support )

2019, 10.2 inch screen iPad 7th gen models ( 1st gen Pencil support )

2020, 10.2 inch screen iPad 8th gen models ( 1st gen Pencil support )

2020, 10.2 inch screen iPad 8th gen models ( 1st gen Pencil support )

2021, 10.2 inch screen iPad 9th gen models ( 1st gen Pencil support )

2018, 11 inch or 12.9 inch screen iPad Pro models ( 2nd gen Pencil support )

2019, 10.5 inch screen iPad Air 3rd gen models ( 1st gen Pencil support )

2021 10.9 inch screen iPad Air 4th gen models ( 2nd gen Pencil support )

2019, 7.9 inch screen iPad Mini 5th gen models ( 1st gen Pencil support )

2021 8.3 inch screen iPad Mini 6th gen models ( 2nd gen Pencil support )

Get the largest internal data storage model you can afford as NO Apple iOS device has ANY expandable storage.

I am sorry that you had to learn all of this, but this does not change any of the facts regarding these old iOS devices.

Sorry & Best of Luck to You

The first generation iPad Air, iPad mini2 and mini3 can only be updated to iOS 12.5.7.

Apple ended major update support for these models of iPad in September 2019 - although they continue to receive occasional “point” security updates, the most recent being released January 2023. These devices cannot be updated to iPadOS 13 (or any later major versions of iPadOS) as the internal hardware does not meet the minimum technical requirements (CPU capabilities and available RAM) for newer versions of iOS/iPadOS.

Some App developers have dropped support for iOS versions preceding iOS 13.x for technical reasons (often because APIs or software libraries upon which they rely have been updated in the new version of iPadOS, making their App incompatible with earlier versions). 

Whilst many App titles remain compatible with your iPad, if you want or need to access to Apps requiring the most recent versions of iOS, you’ll need to consider replacement of your iPad with a newer or current model that supports iPadOS16.

For information, here is a list of the highest version of iOS supported by the older models of iPad (for simplicity - “generations” are shortened to a number) that are restricted in their ability to be updated:

32-bit devices (obsolete)

iPad1 - iOS 5.1.1

iPad2, iPad3 and iPad mini1 - iOS 9.3.5 (WiFi Only models), iOS 9.3.6 (WiFi & Cellular)

iPad4 - iOS 10.3.3 (WiFi Only), iOS 10.3.4 (WiFi & Cellular)

64-bit devices

iPad Air1, iPad mini2 and iPad mini3 - iOS 12.5.7

iPad Air2, iPad mini4 - iPadOS 15.7.7

Newer models are all able to be updated to the current version, iPadOS 16.5.1

• iPad Pro (all models)
• iPad Air (3rd generation and later)
• iPad (5th generation and later)
• iPad mini (5th generation and later)