550 supports without bios upgrade. Some 450 need bios upgrade. I recommend a 450 board cause 3300X is not a super demanding cpu and amd might switch to am5 for zen 4 and 550 board will become pretty useless for future upgrades considering their relatively higher costs over b450.
There has been reports in the last few days of some user accounts being compromised and used for market section fraud. It is therefore recommended that you change your password immediately. Preferably you should also enable 2FA to be safe.