Use these official repositories:
: A privacy-focused, de-Googled operating system available as unofficial builds for various A5 models. postmarketOS samsung galaxy a5 custom rom
Stock Samsung firmware comes with hundreds of apps (Google, Microsoft, Samsung Knox, Bixby, etc.) that run in the background. Custom ROMs strip this down to the absolute basics. You decide what to install. Plus, using a de-Googled ROM like /e/OS or GrapheneOS (if compatible) drastically increases your privacy. samsung galaxy a5 custom rom
Several popular custom ROMs are available for the Samsung Galaxy A5, each with its unique features and characteristics: samsung galaxy a5 custom rom