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[Q] Why does ota update work without data wipe?

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Thanks Meter 8
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Join Date: Apr 2011
Default [Q] Why does ota update work without data wipe?

I'm just wondering why Sprint's ota updates don't require a data wipe, but flashing the stock ROM in a custom recovery needs the wipe? I installed cnexus's rooted stock on my phone and initially tried a dirty flash, but had problems, so I wiped and did a clean install and all is good. My wife's phone is being prompted for the ota and I want to update her but I'd prefer not to have the Knox bootloader. I would simply update her phone as I did mine, but she'll kill me if I wiped her data. So, why can the ota install without the data wipe but the (essentially) same ROM installed manually can't? Anybody know?
(Last edited by metalfan78; 1st January 2014 at 11:51 PM.)
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An OTA just adds new file, a rom overwrites the entire system, that's why a full wipe is always recommended. I think there is a thread somewhere here that has flashable OTAs though. It sounds like she is rooted, so why don't you use a backup app like titanium?
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Titanium is great and you will never have to worry about losing data. Plus its good to clear out the phone every once and awhile to keep it running fresh.
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