Greetings,
v1.2.0 was released in November of last year. If there were issuses, you would have heard about them by now. This FW includes 6 fixes/feature enhancements. As far as the R5 and 6 goes, I would take anything Canon is offering that improves their performance or reliability. I'm sure its quite safe to apply this update.
~Rick
Bay Area - CA
~R5 C (1.0.2.1) ~RF Trinity, ~RF 100~400, ~RF 100~500, +RF 1.4x TC, +Canon Control Ring
~6D2 (v1.1.1) Retiring
~EF Trinity, others ~DxO PhotoLab Elite ~Windows10/11 Pro ~EVGA RTX 3080Ti FTW3 Ultra ~ImageClass MF644Cdw ~Pixel6
~CarePaks Are Worth It
