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Cyrillic is literally greek+glagolitic and it was partly a diplomatic creation of the Eastern Roman Empire(aka Byzantine Empire), in order to bring the slavs culturally closer to them.
Russians have nothing to do with it, other than them claiming they are the continuation of Eastern Roman Empire, something which is kinda laughable but whatever dont let your dreams be dreams.
If your phone has stopped getting security updates, then that is a big issue. Even if the phone is working fine. People are using their phones for banking, paying stuff, email, saving personal photos, etc. You dont want people hacking into your phone and an unpatched phone is an insecure phone.
Which is why samsung/google(and apple before them), have started offering 7 years of OS support. Modern phone hardware, especially flagship tier one, can last for a long time. Other than the battery degrading, the rest of the phone is still powerful enough for everything.