How can I update iOS 10.3.3

If your iPad is currently running, or cannot be updated beyond iOS 10.3.3/4, then have an iPad4.

Update support for iPad4 ended September 2017. The final iOS releases for this model were iOS 10.3.3 (WiFi Only models) and iOS 10.3.4 (WiFi & Cellular). iPad4 cannot be updated to any later major version of iOS as it lacks the minimum hardware requirements needed to run more recent versions. The 32-bit platform upon which the iPad4 is based is obsolete.

Many App Developers have dropped support for 32-bit devices and iOS versions preceding iOS11/12/13 - and have withdrawn older versions of their Apps from the Apple App Store. Withdrawal of Apps supporting older models of iPad is making their utility and usefulness significantly more limited. Once compatible versions Apps are withdrawn, you’ll not be able (re)download or (re)install them.

If Apps that you need to use now have higher minimum iOS-version requirements, your only option is to replace your iPad with newer model. All current models are 64-bit architecture devices that support iPadOS 14; even the entry-level iPad8 has hardware specifications and capabilities that vastly outperform your obsolete iPad4.

I hope this information is helpful - if only in clearly stating the limitations of your iPad4 and your available options.

Return this iPad from where you purchased and get your money back. as you purchased a nearly 9-10 years old iPad that has not been supported by Apple, in 4 years you can't get any useful apps for, any longer, and that is, basically, nearly obsolete in 2021.

If you need/want an iPad with an up to date iPadOS with access to current, updated apps, then 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, locally or 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.

Look at any iPad model that is from 2015 and later year models.

Like older iPad Pro models from 2015-2017

2017, 2018, 2019 and 2020 iPad 5th, 6th, 7th, 8th gen iPad models.

Purchase an iPad with the greatest internal data storage space that you can afford as no iOS device has any expandable internal storage space.

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

Sorry & Best of Luck to You!

If you're referring to an iPad 4, you can't. Otherwise, use a computer or the Software Update function in Settings to update it.

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Settings - general - software update, if it doesn’t show any update available that means that your iPad doesn’t support iOS 10.3.3