Bufesrac

I’ve had a similar issue like Loftus: the red button was out no matter if seat was locked or unlocked and the rim was off like on the first picture of the original post. I tried to take off the rim by hands but it didn’t budge so I busted out a large screwdriver and wedged it under the corners of the other side of the rim (where the opening handle is) and gave it a nudge. The whole rim just came off fine (broke nothing luckily) and after checking the red button (which was perfectly fine) I just refitted the rim and voila: works as expected now. 🙂 So bottom line: there are two long (4-5 cm) plastic “tongues” with a hole at the end on each side of the latch near the opening handle that just click in place way down that you need to force open, then the whole rim comes off. Hope this helps.