I was using browserhax on a 9.9 firmware, with menuhax installed too. I tried to "undo" the upgrade by using a cartridge to update out of 9.2 but that was a big mistake as my browserhax is unusable right now. My only option right now it seems is to find another exploit to get into the homebrew stuff
I know that it's frustating, but probably you just need to try many times until it starts correctly.
I can be wrong but I know that the downgrading process starting rate could depend by your entrypoint. I used browserhax to access the HBL, what are you using?