Answer

If by “Ulta Navkar” you mean the reverse order of the five main Navkar lines, it is:

Namo Loe Savva-Sahunam Namo Uvajjhayanam Namo Ayariyanam Namo Siddhanam Namo Arihantanam ( oshwal.org.uk)

Explanation

The standard Navkar Mantra starts with Arihantanam and then moves through Siddhanam, Ayariyanam, Uvajjhayanam, and Savva-Sahunam. So the “ulta” form is simply the same sacred sequence recited in reverse order. ( oshwal.org.uk)

Spiritual Understanding

In Jain Dharma, the Navkar Mantra is the most revered mantra, and its traditional order is especially important. The reverse form is used by some devotees in devotional practice, but the मूल/मुख्य recitation remains the standard Navkar order. ( oshwal.org.uk)

Takeaway

If you want, I can also give you the standard Navkar Mantra, its meaning, or the Gujarati/Hindi version.