Kernel upgrade from 700 to 720 in HP Unix

Dear Expert Team,

We want to upgrade our SAP Kernel from 700/291 to 720/401

After replacing Kernel file . We are able to start Lisner and Oracle but SAP Instance is not Starting.

We are using SAP ECC 6.0 with Oracle 11g on HP Unix 11.31 ia64 .

How we can update kernel 700 to 720? Its different process.

Regards

Pooja