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Troubleshooting

Fixes for the cryptic ADB errors that send Android developers in circles — device not found, offline, unauthorized, and friends.

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Fix

ADB device not found — every fix that actually works

Driver issues, USB debugging toggles, port roulette — diagnosed in order.

 Fix

"Unauthorized device" — how to fix the RSA prompt

Revoke USB debugging keys and re-handshake without losing your mind.

 Fix

ADB shows device as offline

Reset the ADB server, refresh RSA keys, and bring your device back.

 Fix

"Waiting for ADB device…" hangs forever

Why it happens, and three quick fixes that actually clear it.

 Fix

Every INSTALL_FAILED_* error decoded

Signature mismatch, downgrade, version code conflict — what each one means.

 Fix

"ADB no permissions" on Linux/Windows

Fix the udev / driver permission errors blocking your connection.