It won’t let me update

Hi Zaharalftin,

Welcome to the Apple Community.

Wondering if you have access to a computer ?

Apple support have an article online that may help guide you.

Update your iPhone, iPad, or iPod touch

(You can click the link in the article for the way to update using the appropriate computer)

https://support.apple.com/en-us/HT204204

or

If you see an Update Failed alert after iOS update or restart

https://support.apple.com/en-us/HT208733

Hope this helps :-)