If you are refering to x450a or x450e series, those support 10base-T, full and half duplex.
I guess maual setup of speed and duplx may be needed in case your PoE devices do not support auto-negotiation.
Below is a command to set them up manually.
configure ports auto off speed 10 duplex fullPersonally I think it's time for you to say goodbye to old guys.
They need some rests 🙂