From Xda論壇大大:http://forum.xda-developers.com/showthread.php?t=1229775
Now that you're EVO 3D is rooted, you want to keep it that way!
It wouldn't be a bad idea for ROM devs to build these changes into their ROMs to prevent someone new or unfamiliar with rooting from losing their root!
This guide will show you some things you can do to prevent accidental taking of an OTA.
STEP 1. The easiest step ANYONE can and should do.
Navigate to Menu/Settings/System Updates/HTC Software Update/Scheduled check, and uncheck it.
STEP 2. Remove or comment out the following FOTA (Firmware Over-The-Air) URLs from build.prop
# For FOTA setting (leave empty value to use default) ro.htc.checkin.url = http://andchin.htc.com/android/checkin ro.htc.checkin.crashurl = http://andchin.htc.com/android/crash ro.htc.checkin.url_CN = http://andchin.htccomm.com.cn/android/checkin ro.htc.checkin.crashurl_CN = http://andchin.htccomm.com.cn/android/crash ro.htc.checkin.exmsg.url = http://fotamsg.htc.com/android/extra/ ro.htc.checkin.exmsg.url_CN = http://fotamsg.htccomm.com.cn/android/extra/ ro.htc.appupdate.url = http://apu-chin.htc.com/check-in/rws/and-app/update ro.htc.appupdate.url_CN = http://apu-chin.htccomm.com.cn/check-in/rws/and-app/update ro.htc.appupdate.exmsg.url = http://apu-msg.htc.com/extra-msg/rws/and-app/msg ro.htc.appupdate.exmsg.url_CN = http://apu-msg.htccomm.com.cn/extra-msg/rws/and-app/msg
STEP 3. Rename or delete the following file:
/system/etc/security/otacerts.zip
STEP 4. Rename or delete the following APK file:
/system/app/CheckinProvider.apk
There may be other ways to block OTA updates, if you know of any I haven't listed, please send me a PM!
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