4.3.0 and 4.3.0-rtcfix
Version 4.3.0 was not released publicly. Most people should use a newer release instead.
v4.3.0 was released on 2021-05-06 for our factory to use to provision new OT-2 Refresh robots.
v4.3.0-rtcfix is a special release made much later, on 2022-08-09. It resolves provisioning problems at the factory. It's identical to v4.3.0, except that it uses v1.7.1 of our robot OS instead of v1.7.0.