TP-Link TL-PA551 - Appendix A: Troubleshooting; 1. The Power LED does not light up.; 2. The Ethernet LED does not light up.; 3. The Powerline LED does not light up.

TL-PA551 AV500+ Powerline Adapter with AC Pass Through
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4.4.1 Upgrade Firmware
Click the Upgrade Firmware button to upgrade the version of the firmware for the adapter and the
following dialog will pop up.
z NVM: None-volatile memory. It is used for upgrading the firmware.
z PIB: Parameter Information Block. It contains configuration values that establish device
network identity, general capabilities and operational modes.
If you want to upgrade the version of firmware for the device, please select appropriate Firmware and
PIB files together. New firmware versions and PIB files are posted at www.tp-link.com
and can be
downloaded for free.