The ARRI ALEXA 35 has just recently started shipping, and some of those cameras were shipped with the ALEXA 35 Software Update Packet SUP 1.0.3 Revision 3 installed. ARRI has subsequently released a new maintenance update SUP 1.0.3 Revision 4, which contains important bug fixes and improvements to system stability.
This is a very minor update and there are no new features in SUP 1.0.3 Revision 4 in contrast to Revision 3.
How to update
ALEXA 35 SUP 1.0.3 Revision 4 can be installed in all previously shipped ALEXA 35 cameras, and we recommend updating from SUP 1.0.3 Revision 3 to SUP 1.0.3 Revision 4. However, we do not recommend updating to a new SUP in the middle of a production. Please read through the Release Notes, which contain detailed update instructions, before you update your camera.