I upgraded to windows 10 with iso , (i used same iso with my other lenovo laptop , it worked perfectly with it)
After upgrading to windows 10 cursor went away and during installation too there was no cursor , i hand to manage with keyboard to insatall it. After installation there was no cursor too.
I installed ELAN driver , it installed successfully but sttill no cursor (No ELAN tab in mouse and touchpad settings)
I installed Synaptics driver , it installed successfully but sttill no cursor (No Synaptics tab in mouse and touchpad settings)
tested all versions available , no mice driver shown in device manager , even in mouse and touchpad settings there is no touchpad section.
when i attached usb mouse it worked.