====== Troubleshooting ======
Start with the current version, device architecture, service status and the exact error message. Do not paste passwords, tokens, pairing codes, private keys or full device serial numbers into a ticket.

===== Cannot sign in =====
Confirm the NAS address, account and time. NAS desktop, SSH, SMB, ApuConnect and community accounts are separate. Reset only through the supported administrator flow.

===== Upload or sync failed =====
Check certificate trust, pairing status, destination permissions, available space and the final hash. ApuSync direct transfer does not silently fall back to cloud relay.

===== Update failed =====
Read the update service log, preserve the rollback state and verify the current version before retrying. Do not delete the updater state or force a downgrade.