> For the complete documentation index, see [llms.txt](https://docs.payfacto.com/payfacto-knowledge/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.payfacto.com/payfacto-knowledge/maitred-pos/maitred/maitred-pa-dss-implementation-guide/pa-dss-requirement-7.2.3/update-installation.md).

# Update installation

Updates should only be downloaded and installed by trained and certified Maitre’D resellers and support technicians.

Before installing a service pack:

* Take note of the current version of Maitre’D you are using. 
* Make sure that the system is NOT set in 24-hours operation mode.
* Make sure that the End-of-Day has been done and that there are NO SALES or OPEN TABLES in the current day
* Take a full system backup of the system you are about to upgrade.