I have Hiya CFW now, but I can't redownload any of my old Dsiware because it says I have 0 blocks, and sure enough in settings I have 0 blocks. But this is only in Hiya CFW. If I go back to the OG Dsi menu I have 850 blocks. How can I get DSi ware?

TMFH is outdated. NTM should be used instead, and supports installing to SDNAND as well: https://github.com/Epicpkmn11/NTM/releasesYou have to use this program to install DSi ware. Doesn't work with .cia files.
https://github.com/JeffRulz/TMFH/releases
Here's also a neat program to make shortcuts to DS games through nds-bootstrap: https://gbatemp.net/threads/release...iyacfw-forwarders-on-the-dsi-directly.606964/