which apk blocks ota update?

Hi I want my phone to not take the OTA update, and i want to know which apk i need to remove from the system to do this.

i have removed
fotaagent.apk
sprintdm.apk
urgentfwupdate.apk
urgentfwupdatenfc.apk

those seem like the most likely apks, can someone tell me if they know which apk stops the OTA update

thanks

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