help me how to change model ds-7608ni-k2 to ds-7608ni-h2

thanks for the reply

My project clients need to change to sync with their project. I really need a deadline to help people
 
I know that, but my boss made me do it
I have contact with hikvision asking them for help but they say too little to solve the job
 
I have the nvr name ds-7608ni-k2 but in my customer's system it is ds-7608ni-h2 and now i want to change ds-7698ni-k2 to ds-7608ni-h2 for the customer