On left – Boult Audio co-founder Varun Gupta. On right – Fire-Boltt founder and CEO Arnav Kishore Greater Noida, May 12, 2023It was indeed a bolt from the blue for many, including top dogs Noise and boAt. An unassuming rival sprinted at an electrifying speed and cornered a staggering market share in smartwatches. From a paltry 0.3 percent in 2020, this little-known bootstrapped brand from Delhi-NCR had grabbed a meaty 11.6 percent market, making it the third-biggest in the pecking order after Noise and boAt in 2021. We spread like wildfire, smiles Arnav Kishore, who co-founded Fire-Boltt along with his sister Aayushi in 2015.For the next five years, the siblings…