Answer

If you want one mantra that is always appropriate in Shri Nakoda Bheru Mandir, chant the Navkar Mantra. It is the most universal and sacred prayer in Jain dharma, and Nakodaji is a Śvetāmbara Jain tirth where Bhairav is revered as the guardian. ( jainknowledge.com)

Navkar Mantra:

णमो अरिहंताणं णमो सिद्धाणं णमो आइरियाणं णमो उवज्झायाणं णमो लोए सव्वसाहूणं

Explanation

The Navkar Mantra is a salutation to the Panch Parameshti. It is accepted across Jain traditions and is the safest choice if you are unsure about any temple-specific vidhi. ( jainknowledge.com)

Spiritual Understanding

In Jain dharma, the purpose of chanting is to cultivate humility, purity of mind, and remembrance of the path to liberation. The Navkar Mantra helps keep that bhav strong in any sacred place. ( jainknowledge.com)

Takeaway

If you are in doubt, chant the Navkar Mantra. If the temple has a specific local Bhairav vidhi, follow the temple tradition respectfully. ( jainknowledge.com)