smartcard reader no longer works after upgrading to Sequoia

linus1506 wrote:

Downgrading to Sonoma makes it work again, tested on iMac and MacStudio M1

I would look for some update to your third party smart card to be compatible with macOS Sequoia...

if in doubt search the developers website or contact their: Support/Help/FAQ/Known issues/compatibility/updates…

Contact a third-party vendor - Apple Support

Contact a third-party vendor - Apple Support

Can you tell me a model that is compatible with Sequoia?

The SCR3310 v2 has worked for me for over a decade. Never needed any drivers for it.