In 1399, Ahmad aka Malek II, the ruler of Khandesh died. He had divided his kingdom in his princes. Nasir was given east part while Iftikhar aka Hasan was given west. Nasir established Burhanpur in 1400 and also won nearby fort of Asir from Hindu king. Hasan settled in Thalner. Nasir won Thalner from Hasan and imprisoned him, with help of his relative Hushang Shah of Malwa, before he receive help from Ahmad Shah. Nasir attacked and imposed siege of Nandarbar and Sultanpur of Gujarat Sultanate in 1417. Ahmed sent an expedition against Nasir of Asir under Malik Mahmud Barki or Turki and left for Modasa. When the Malik reached Nandoḍ he found that Gheirat Khan had fled to Malwa and that Nasir had retired to Thalner. The Malik advanced, besieged and took Thalner, capturing Nasir whom Ahmed forgave and dignified with the title of Khan.