You can do that via recovery. (Hold r as you boot from a cold boot.)
Toggle flash0 in advanced. Copy the files except ltn0.pgf and vsh.prx to vsh/resource
Copy ltn0.pgf to font/
If there is a vsh.prx, well that's kind of unsafe and I don't recommend it, but I also don't know where it goes. Most themes don't have it though.
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