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I'm trying to programmatically find my phone's first activation / unboxing / last factory reset date. I know that there isn't an API for that, but I tried a few things:

1) PackageInfo.firstInstallTime() for a system package
2) BUILD.Time
3) new File("/proc/cpuinfo").lastModified()

But none of them gave the exact true date. Any ideas ?
Thanks in advance.

amitooshacham
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