The wiki did mention that some high speed TF cards do not work with it. Although I have several class 10 high speed high capacity TF cards and they all work. I originally had issues with my TF cards too. I also previously used the card with Pi Zero W, but issue was resolved after I formatted it to erased the exfat MBR with diskutility on macOS. I notice that the openwrt image have about 32mb empty space in the beginning and in between the 2 partitions. Maybe flashing the image it doesn’t overwrite something in the beginning of the card where the boot sector is supposed to be.
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