The newer versions of KingRoot (including 5.4.0) are rumored to include bundled apps or adware. Immediately after rooting, you may find unwanted apps like "Hot Apps" or "Hot Games" installed. These can be uninstalled with Titanium Backup (which requires root).
While "all" is a strong word, KingRoot 5.4.0 boasts an impressive compatibility list. It works best on: The newer versions of KingRoot (including 5
Overclock or underclock processor frequencies to manage battery life. The newer versions of KingRoot (including 5