Start with the most common causes before resetting the wallet, restoring from a recovery phrase, or trusting a support message.
The USB cable powers the device but does not carry data, or a hub, dock, adapter, or loose port is interrupting detection
Windows device recognition, macOS accessory permission, browser access, or another wallet app is holding the KeepKey USB session
Firmware or update mode changed how the device appears before the app finished reconnecting
A zero balance is being treated as fund loss before account, network, app sync, and restore context have been checked
A restored KeepKey view can differ because the phrase, derivation path, account type, selected network, or wallet app cache is not the same as the original setup
After firmware work, KeepKey may need to leave update mode, reconnect over a data cable, close stale app sessions, and refresh account data before balances appear
A fake client, copied support link, or recovery helper is asking for seed words, PINs, private keys, or remote access