Question [Q] Phone got rooted and it unrooted itself and not rooting..

Hi guys.. I'm new to xda and this is my first thread.. please help this novice..

I have a Micromax a110 and I rooted it with shaume (a Chinese flash tool)..
It rooted good and was perfectly fine.. after some weeks, it mysteriously got unrooted and not rooting anymore...

I tried a couple of rooting methods..
In sp tools, my phone is not detecting in my computers after installing all the drivers in off mode..
Root by binary and kingo android root didn't work.. and many self root apps.. root master, framaroot, etc didn't work..
In shaume, the app I used before.. didn't detect my phone or the process gets finished around 15% and not rooted..

Please tell some suggestions.. and kindly reply me..
Can I flash superuser.zip in stock recovery???

My phone is in stock jellybean 4.1.1 and stock recovery and stock kernel.. please help guys.. thanks!!!