Akbash was never supposed to inherit the title of Khan since his brothers were already ruling Yarkand Khanate.
Afaq then set his son Yahya Khoja as the Khan of Yarkent Khanate in 1692.
On the other hand, Begs in Kashgar had different ideas, they invited Kirghiz tribes and installed Akbash's son Mahmud as a Khan.
Kashgar and Kirghiz joint forces attacked Yarkent and captured it, making Akbash a captive.
The Oirats successfully took back Yarkent city but Akbash lost his title permanently.