A major "story" with Version 21 is the incompatibility between minor revisions. Version 21.03
Rockwell Automation Product Compatibility and Download Center (PCDC) Updating L33ER PLC Firmware without Version 21.11 Studio 5000 Version 21.11 Download
. If a project was downloaded with 21.03, you cannot upload it using 21.00. Hardware Shift: A major "story" with Version 21 is the
The "proper story" behind Studio 5000 Version 21.11 is often a source of confusion because is not actually a software version, but a controller firmware revision but a controller firmware revision