Check that you are using a Canon battery. I know this sounds strange, but I recall we had problems with non-Canon batteries (el cheapo) and card read errors. Not sure why. Power down the camera, pull the battery. Power down the camera, pull the battery and wait a minute then reinsert; Check the card contacts and clean them
Also. Just my opinion: but the day before a paid shoot is not the time to learn your flash radio trigger is incompatible with your flash. Or to try and swallow the whole of off-camera flash knowledge. Rescheduling the shoot or going without off-camera flash may be your best solutions, here.
I've got a Canon 40D running firmware 1.0.8, and I also have a 580EX Speedlite. 99% of the time I do flash work, I use the speedlite. However recently I've tried to use the onboard flash and found it wont work. EDIT: after rereading it would appear that you are not actually triggering the camera remotely and your switches are set up correctly. The answer for that case is: check that the camera has flash enabled and set to "external" and that the flash trigger is fully pushed onto the camera hotshoe. The pins on the Yongnuo trigger have comparatively

After 1400 pictures in total the flash stopped working ( manual mode , flash in upwards position) . It only fires sometimes , so the bulb isn’t broken , but It’s just 1 out of 5 pictures where the flash works . Tried everything from factory reset , fully charged batteries , power reset . Also flash pops put when in auto mode , so no button

Even RP has the same sensor and max shutter speed as 6DII. It does not mean that the high speed sync will work. I have tried all M and ttl and ended up with similar results, i.e., clear banding (90% picture dark and top 10% bright) in my pictures as soon as shutter speed exceeds 1/200. Firmware for camera, flash and triggers is updated.

Even when it’s not set to contribute real light to scene, my pop-up flash on the Canon 7D forces my camera to report “Busy” while it cools down. It prevents me from taking another photo for 10 to 20 seconds at a time. This is especially frustrating as I’m not asking the pop-up flash to fire at full strength.
BJrWR.
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    • canon camera flash not working