Download link: Canon EOS 90D Firmware Version 1.1.1
Firmware Version 1.1.1 incorporates the following enhancements and fixes:
1. The option to capture both 4K and Full HD movies in the frame rate of 23.98p has been newly added.
2. Fixes an issue where error code “Err 01” may be displayed when using EF85mm F1.8 USM or EF100mm F2 USM lenses.