What should I do if fail to upgrade the firmware of my TP-Link router?
Amazon.com: TP-Link N300 Wireless Extender, Wi-Fi Router (TL-WR841N) - 2 x 5dBi High Power Antennas, Supports Access Point, WISP, Up to 300Mbps : Electronics
Firmware Update Tplink - Tplinkrepeater.net
TP-Link routers can be hacked: What to do now | Tom's Guide
Download for TL-WR840N | TP-Link
How to upgrade the firmware of TP-Link Range Extender (new designed blue UI)