If your Android date is set to 2023 but the server is in 2026, the token generation fails with 601. The Fix:
Version specifically corresponds to the Android 6.0 "Marshmallow" era. android google account manager 601 link
You can find the official APK from several trusted third-party repositories: If your Android date is set to 2023
Most modern devices update this component automatically. However, version 6.0.1 is specifically required for: android google account manager 601 link
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.
Download the APK from one of the links above using your mobile browser.