To install menuhax I needed to bypass the browser nag using
this guide.
For the first ton of tries I kept getting the "Failed to get CIA file information" error. Once I reset dbs, and starting opening then closing FTBrony I got it to partially downgrade. To make it able to boot I had to take out the SD card, then reinstall menuhax for the frankenfirmware. The next time it installed CIAs it successfully downgraded.
Formatting/cleaning the SD card with diskpart might have also helped.
System: New 9.9-U
Entrypoint: Menuhax
9.2 pack hashes:
MD5: E6339468A1E82B1D50E9222F017C0477
SHA-1: ECA4BA9DF44B03748BB8AA9C42186B38C62C0D1A
SHA-256: 38EA53D81763408178D796492D6397CFC1EAE422A8A2A4B1270678E1AB30043C
SHA-512: F27F15B39469D1CB61A4EE33C47A2B3928B338DDD402F13FA92C963106E42A0AF940412B7D2736259A73B46988585517A2DB6876754B579BCD2AF996750A7EA8