Xolo A500s Lite Flash File.flash tool.firmware and all the drivers available here that you can download directly via Google Drive.xolo flash file download.
How to flash
1.First download and then click Extract Xolo A500s Lite Flash File
2.Install the usb driver (skip if drivers are already installed)
3.Now be sure to install the driver.
4.Now flash tool to be opened.And to select the Firmware.
5.Find usb cable in your phone first and then insert the battery.
Important Notes :
Take a backup of your parsonal data before flash.
all data is deleted after flash.Whenever a thing is wrong, this
helps to recover the personal data