When system updates freeze or custom ROM installations break, users frequently experience constant "Google Play Services has stopped" crashes. Manually reinstalling the matching Google Account Manager package forces the verification system back into a stable state. Verified Download Links for Google Account Manager 6.0.1
If you need to replace or update your current manager on an older device: Google Account Manager 6.0.1 - APKMirror android google account manager 601 link
Automatically syncs app data, contacts, and sharing settings across your Google accounts. When system updates freeze or custom ROM installations
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Step 5 — Factory reset as last resort: When software fixes failed, Marco performed a factory reset (after his backup). On first boot he signed in successfully; the device accepted his account.