Any way to unroot lenovo a6000 plus to receive ota updates?

Any way to flash stock rom and unroot lenovo a6000 plus to receive ota updates without bricking the device? I want to root lenovo a6000 plus but I'm afraid that it won't unroot and return to its original state as i have searched everywhere. No dedicated flash tool for lenovo like xiaomi devices. Made a big mistake buying this phone.