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Android flashing/backup guides often mention that NVRAM stores IMEI, WiFi MAC, etc., and that loosing it is real bad thing.

What bothers me is following: NVRAM is, judging by name, RAM, so it sounds like it's not on eMMC. On the other hand, all the backup guides I found make me think that it's not true, at least not entirely.

So my questions are:

  1. If I simply dd my phone's eMMC, will the resulting backup be sufficient to restore NVRAM?
  2. Is it sufficient to just dd this backup back to eMMC?
  3. (bonus) On average modern phone, is there any firmware/etc. that is not stored on eMMC and can be accidentally corrupted? (i.e. not counting e.g. eMMC's own firmware, which is hard to reach in general, even more so accidentally)
EvgEnZh
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  • nvram.bin is supposed to be a file located in the /efs partition and, therefore, in the eMMC. It could never store data if it was a kind of RAM, since those memories are volatile by definition. – Grimoire Sep 27 '16 at 16:12
  • Well, it's NonVolatileRAM, that's why I'm asking. Although you probably are right, it has to be battery-backed or something so not very reliable. – EvgEnZh Sep 28 '16 at 08:02

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