The "Hassan Zip" or "Hassan Tool" for Spreadtrum (SPD) IMEI writing typically refers to a custom-packed version of the standard Spreadtrum WriteIMEI

The legal steps are:

What is Hassan Zip Exclusive?

Connection

: The device is connected to the PC while in Diag Mode. This is often achieved by holding specific volume keys during power-up or using a dialer code.

Bottom line:

This is repair/service industry jargon from the GSM mobile phone unlocking and repair community — but often crosses into illegal territory.