SRS Airbag light on

2009 Honda Accord EX. SRS Airbag light on. When using a scanner, it gave these permanent DTC codes

DTC 61-1 Modulator-control unit initial IG low voltage
DTC 64-11 Steering angle sensor power circuit short
DTC 71-21 Right-front or left-rear different diameter tyre malfunction

I erased the codes, light went off, then came back on after some time and now this one has been coming up

51-50 Internal failure of the SRS unit

How do I fix these so the SRS airbag light stays off?

Looks like according to that code you need a new SRS computer