生根可以删除所有恶意软件，病毒和后门吗？ -- applications 领域 和 rooting 领域 和 malware 领域 android 相关 的问题

I ask this question because I read somewhere that there was a Chinese smartphone with in-built malware which could not removed even by rooting.

(I searched the article everywhere but couldn't find it. So, no source. Sorry!)

Is there a possibility that any kind of malware or virus, that could harm your device and/or your privacy, will remain even after rooting your device?

EDIT: By rooting, I actually meant rooting and then flashing a custom ROM, i.e, reinstall android. Sorry for the confusion.

Can malware and viruses persist after this?

Even after installing custom ROMs some area on the internal storage is left unchanged and if the malware resides in that area of the internal storage it won't be deleted even after you flash a new ROM but it is a very rare case when a malware goes so deep into the system.
If you want another example for this then try to install a boot logo (i know it isn't a malware) but even after you flash 100s of ROMs it will never change the boot logo of your device and this proves that some code remains unchanged even after flashing new ROMs

Rooting doesn't have anything to do with removing malware. Rooting is process when you get a superuser on your phone so you have full control over device (like accessing all files and folders etc.) What you can do is to remove system apps. And those chinese phones had malware probably on kernel level or built in into system, not as application.

Rooting allows you to modify the system and access all app data. It does not change anything regarding already installed installed malware or virus.

If you have rooted the device using an exploit the installed malware may also use this exploit to get root access.

Conclusion: If your device is infected delete it and reinstall an untainted system/image. However advanced malware may even survive a installation of a new ROM potentially in partitions that are not erased or in flash roms of embedded chips.

Therefore the only 100% secure way to get rid of malware is to physically shred your device. No device - no malware.