Arihant,
If you want to use the MII ui5 libs with the openui5 libs you will probably have to make your own copy of the /XMII/JavaScript/bootstrap.js file and modify the loadUI5Core() function to point to the location of your openui5 libs. I think you will still have problems thou because I don't think the charting libs (sap.viz) that the MII libs are dependent on are included as part of openui5 yet. Your best bet is to install and use the standard ui5 libs from SAP.
Regards,
Christian