Good find @psb777, thanks for posting about this.
We’re making some changes in the bootloader for future manufacturing runs, and the patch programmer had been updated accordingly. I didn’t realize it was a breaking change however, so it shouldn’t have been on the master branch.
I’ll make sure we get the latest master branch in a state where users can download straight from there without a problem.
Right now, the latest patch programmer binary users with existing Cores should use is this one from Feb 13. It’s 23472 bytes.