Firmware Update required when using YN-622C-TX Flash Trigger on M series


Staff member
Jan 3, 2008
Pasir Ris
Although it's third party product, but it's related to Canon M (Mirrorless) series:
Recently I noticed that when using the flash controller on Canon M5 the flash would not fire. Cross-checking with a 77D showed normal function.
Luckily this controller allows firmware updates and the vendor also provides them. Firmware in controller (from factory) was 1.03, recent firmware from YN ( is 1.11.
After applying the update (worked exactly as described on website and text file included in zip archive) the flash controller works well with M5.
(Updating a Metz flash was far more troublesome...)

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