The charter so ratified may be amended by amendments proposed and submitted by the legislative authority of the city to the qualified electors thereof (or by petition as hereinafter provided), at a general or special election, and ratified by a majority of the qualified electors voting thereon and approved by the governor as herein provided for the approval of the charter.
Notwithstanding any provision of this section to the contrary, no charter shall provide a city with any power to violate Article IX, section 25, which preempts such power.