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by talonstriker 4401 days ago
On most (if not all), the "firmware" is under the /system partition. That partition is mounted as read-only. You need root to remount it as r/w.

AFAIK, rooting exploits in the past took advantage of buffer overflows and remote code exploits to execute code at a raised privilege levels. Now a days, that's also difficult since past vulnerabilities have been fixed and the proliferation of SE Linux.