Just one thought - does it matter what name I give to the SD card when I reformat it?
Usually not. I usually leave my recovery card as NO NAME.
Does your card name appear in all upper case letters? Also, check the size of the card after you’ve flashed it. It should 2.15Gb. If it’s still 4Gb, that’s a possible indicator that the image wasn’t flashed.
Here’s what I think is going on:
- Sounds like you’re using an older macOS version (like Mojave or older?)
You need to format to FAT—not exFAT. Why? Here’s what Apple has to say about it: File system formats available in Disk Utility on Mac - Apple Support (scroll to the bottom of the page). - Download Default Content 2.1 but don’t copy it to your SD card yet until you’ve completed the recovery (flashing) process. Why? When you flash the SD card, it replaces everything on the card and you’ll end up having to copy the Default Content back to your SD card again.
At this point, what should you do?
- use or buy a new 4Gb class 10 SD card; a new one out of the wrapper is already in a format that works with the BeatBuddy (BB) pedal; if that’s not possible, format your existing SD card as FAT and then,
- follow the Instructions for Mac exactly as I have written them in the first post of this thread; don’t read into them, add or miss any of the steps.
Once your pedal display is working, I would set that SD card aside and label it as RECOVERY and use a new one for your project. Why? Because if you have properly flashed your RECOVERY SD card, it will now be 2.15Gb instead of 4Gb and you would have to Erase it to FAT to get it back to 4Gb
Let me know how you get it working.
Because your power was interrupted, you might want to check that your BeatBuddy (BB) power supply is still working.
If for some really strange reason the Mac doesn’t seem to be able to format the SD Card to FAT32 and you might by chance have a digital camera that takes SD cards, you could try doing a full format of the SD card in the digital camera. Most digital cameras will format to FAT32. It may add a couple folders for images and other info, but the Mac should be able to read the card and you can delete the folders clearing it up so the BB firmware can be put on it.
This image is an SD card formatted in a Canon digital camera. I did remove the extra folders that the camera created.
Many thanks for your follow ups on this. I’m using the next to current Mac OS - Monterey - which does give me the MS-DOS (FAT) formatting option. But I also tried the camera formatting option - still no success. The power supply is fine (tested with a meter and with other 9v units). Thanks again for the suggestions.
Please let us know what Support has to say.
I think I found out what the issue was and after having successfully tested the modified process, I have updated the Mac forum instructions. If you still have the RESCUE SD card that you flashed, please try adding the 5 firmware files to the RESCUE card and try that on your pedal.
If that doesn’t work and while you wait on the mail from Support, you can try following the instructions again but first you’ll have to restore your SD card to 4Gb following the NOTE I included at the bottom of the Mac instructions.
Don’t blame you though if you’d rather wait on Support 
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Thanks - I’m away for the next few days but will try your updated process when I get back - and will post again with the results
Your updated process worked without a hitch - many thanks!
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Thanks for letting us know.
midway, did you ever get it working? If so…how? Thanks
no - it’s a pretty cool door stop now! Even as a door stop it’s awesome!