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

Code:
# 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:

Code:
/system/etc/security/otacerts.zip


STEP 4. Rename or delete the following APK file:

Code:
/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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