Hi Brett!
That error at the end looks like the one you encountered and eventually resolved in this thread: (resolved) Error when using program-dfu with Diasy bootloader and the APP_TYPE = SRAM
So I recommend revisiting it and double check that you didn’t miss any steps. Let me know if there’s still an issue.
And I don’t know if this is related but it could be a workaround: dfu-util: Last page at 0xfc08ffff is not writeable - initialized arrays in QSPIFLASH · Issue #545 · electro-smith/libDaisy · GitHub