Error trying to install HiyaCFW

I just bought a DSi secondhand and installed Unlaunch via the Memory Pit method. I've been following the https://dsi.cfw.guide tutorial without issue, up to the point of installing HiyaCFW.

I backed up my NAND with FWTools, and the HiyaCFW Helper detects it without issue, but after I start the install process, I get this error (Picture attached).



I've tried backing up my NAND again, to the same error. I've ensured my target SD Card is...

Error trying to install HiyaCFW