Not a native English speaker here, so forgive any spelling mistakes. I have an Iphone 5S stuck on the IOS 12.5.5, I just found out about the Beta Software Program and installed an IOS 15 Beta profile on my device, but whenever I try to update my software, it states IOS 12.5.5 Your software is up to date and a new update never shows up. I've restarted my Iphone, but the update is still not available. Most apps require IOS 13 for me to download or update my apps, so I need an IOS update!!
Unfortunately, iPhone 5s is limited to iOS 12. You cannot install versions beyond iOS 12. So, impossible to install iOS 13, 14 or 15 (even if you can download).
You are not alone.Similar phone and incompatible updates .
Story is no different for Mac too, I bought an expensive high end MacBook Pro late 2014 (then highest end model) , It can't update to latest software. I have another iPad 2nd gen, same story.
When I gets low at bank balance and look at all these idle bricks on the table, All I can do is just... sigh!!!