1

If yes then how can one ensure that its %100 wiped clean?

Android 7 | rooted

EDIT: Same question but how about when rom is flashed ?

3

Yes, it's entirely possible if

cases where an update to system introduced a persistent system level malware (usually a spyware, adware type), or one or two system apps (usually system update apps) acted like a malware right from the time a user started using the device. (see 1, 2, 3, 4, 5 as examples)

By doing a , you are only removing user installed apps and data. The only solution for the first case is to install stock ROM (if you are on stock) or install a custom ROM by clean flash (usually, OEMs /custom ROM providers give detailed instructions on this). By installing a ROM, the /system is wiped clean and installed, getting rid of the trouble.

If you are a victim of the second case, there isn't much you can do unless you find another ROM for your device.

Of course, you need to review your apps and make sure you don't install from unverified sources and take precautions to not get into this situation again.

6
  • Thanks for answering! Is it possible to flash rom through TWRP? If yes, is that considered clean? – JJrussel Jan 19 at 0:41
  • Yes. It is possible depending on the ROM. You will need to wipe /system in addition to /data to flash but follow instructions provided by the ROM chef – beeshyams Jan 19 at 0:43
  • Where do I find the "rom chef" instructions for my rom? (Moto C Plus xt1723). – JJrussel Jan 19 at 0:47
  • Xda and other sources like OEM instructions – beeshyams Jan 19 at 0:48
  • So is this a wipe clean (which includes deleting /system and /data) AND THEN install/flash rom? – JJrussel Jan 19 at 0:49

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