Hello ambmnb, Welcome to the Canon Forums and thanks for your inquiry!
For troubleshooting we would recommend that you remove the lens and memory card and see if the camera will function with a fully charged battery. If the camera still locks up then we would ask that you contact support for further troubleshooting.
For more details regarding this error, please contact our support group using the "Contact Us" link below for additional assistance.
This didn't answer your question or issue? Find more help at Contact Us.
07/31/2023: New firmware updates are available.
05/31/2023: New firmware updates are available.
05/18/2023: New firmware updates are available.
04/20/2023: New firmware version 1.4.1 is available for EOS R3
03/30/2023: New firmware updates are available.
2/07/2023: New product announcements!EOS R8 EOS R50RF-S55-210mm F5-7.1 IS STMRF24-50mm F4.5-6.3 IS STMRF15-30mm F4.5-6.3 IS STM