Mantras are only endowed with transformative energy if given in initiation (dīkṣa) with the mouth of the Expert. It's not necessarily a lot accurate pronunciation, but rather the ability with which the mantra is endowed that provides it reworking capability. Cundī dhāraṇī or mantra also first appeared during the Kāraṇḍavyūhasūtra: https://bridalmakeup59382.bluxeblog.com/69145657/helping-the-others-realize-the-advantages-of-vashikaran