Updating Symbian phones is a do-it-yourself job nowadays.
059C8T6 is a North American US variant, and I'm not sure it ever received the upgrade to Belle Refresh(?)
I only found the Belle (version 111.030.xxx) firmware files in an unofficial place.
The last Belle Delight custom (unofficial) firmware for the N8 dates back to 2014 and even that will not do what users of modern smartphones take for granted.
I suggest leave the phone as it is and use it for what it does, or gift it to somebody who appreciate its basic phone and camera qualities?
There are workarounds, unofficial collections of apps, updated root certificates etc. posted in this forum and elsewhere.
I don't want to link anywhere or try prepare a list with the exact steps, since a moderator pointed out the N8 is now unsupported in Microsoft Answers.
Search and you will find, if you are willing to spend some weeks on the project.
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Hans