The Nokia 6310 (2021) does not support OTA (over-the-air) updates. A microSD card and a computer are always required.
Unlike smartphones, this feature phone doesn't update over Wi-Fi automatically. It uses a classic method: downloading the update to a microSD card via a computer. Elena relied on her Nokia 6310. It wasn't smart, but it was sharp—crystal calls, a battery that lasted a week, and that satisfying click of the keys. One evening, a tiny notification appeared: “New system version available.” How to Update Software on NOKIA 6310 -2021-
She knew the phone couldn't just "download" it. This was a job for a computer and her trusted 32GB microSD card. Elena powered off her phone, pried off the back cover (the textured plastic felt solid), and slid out the microSD card. She inserted it into her laptop's card reader. On her laptop, she opened a browser and typed a precise address: www.nokia.com/phones/en_int/software-update . The Nokia 6310 (2021) does not support OTA
She went to: → Settings → Device → Device updates → Phone software updates . It uses a classic method: downloading the update