Handset is rooted . The app cannot proceed due to security reasons When installing an android app i got this error . Is there a way to solve this problem without factory reset ?
If you don't want to actually remove root, there are several methods to try to prevent specific apps from determining that you have root access. Depending on the detection methods used by the apps, you may or may not be successful.

Try looking for root hide or root cloak in the Play Store or on xda-developers.com.

If you can install the Xposed framework, you can also try the module Root Cloak.