[sammp]

The server is not at issue here, it's your game. Changing MySQL charsets will only cause problems if you don't convert properly, and tbh you shouldn't touch stuff like that unless you're experienced in DBA and know EXACTLY the implications of changing these charsets long-term. The problem is on your end because the game doesn't support the characters you're trying to type, and I've found that installing a Cryllic language pack for your OS fixes that problem locally, instead of farting around with the DB, using commands you know nothing about. One wrong move and your entire DB breaks.