update 1 by DKDave: Just a quick note on this one - it's not xor. Looks like to decrypt you just have to -1 from each byte. Although it might be that only part of the file is encrypted in this way as it still doesn't load into Asset Studio.
update 2 by DKDave: Just a quick update, may or may not be useful. It looks like the encryption changes every 0x200 bytes, at least in that latest file (huajie.assetbundle) that's how it appears. So it starts off as 0x200 bytes -1, then 0x200 bytes -2, etc
https://www.mediafire.com/file/4joiyw20 ... S.zip/file