官方介绍
OTA不丢root OTA RootKeeper是一款临时隐藏root的应用，备份ROOT，OTA升级完了再恢复
注意：
- /system 分区为 Ext2, Ext3 or Ext4
- 升级时不格式化 /system
- 不支持4.3
更新日志
Due to changes in 4.3 security implementations, OTA RootKeeper cannot work to 4.3 updates.
Root implementations (su and Superuser apks) have to be largely reworked.
This project is not abandonned, I'll see what I can do but please keep in mind I don't have a solution right now.
Details:
XDA Thread: //forum.xda-developers.com/showthread.php?t=1241517
//developer.android.com/about/versions/jelly-bean.html#43-enterprise-security
