Older hardware running Android 5.1.1 often struggles with the heavy background processes of modern Play Store versions.
What is Software Piracy & How it Impacts Quality | Lenovo CA
Downloading cracked APKs can pose significant risks to your device and personal data. These risks include:
Searching for a "cracked" Google Play Store for an older device like Android 5.1.1 (Lollipop) is often a way to fix compatibility issues or bypass restrictions. However, using modified or "cracked" versions of core system apps like the Play Store carries significant security risks, including malware and data theft.
Reviving Your Android 5.1.1 Lollipop Device: Safely Installing the Google Play Store