Hi Maurizio,
You may use below notes to update sybase ASE patches.
1599814 - SYB: Installing Service Packs for SAP Sybase ASE 15.7 (UNIX + Linux)
1607816 - SYB: Installing Service Packs for SAP Sybase ASE 15.7 (Windows)
SAP note 1982469 - SYB: Updating SAP ASE with saphostctrl / sapdbctrl
should be used only with Sybase ASE 15.7 SP100 or higher.
Regards,
Deepak Kori