MAC Address filtering for TP- LINK TL- WDR4900 router. Be sure to update this information if you add or remove devices. Damage to the product as a result of using third party firmware will void the product' s warranty. After Upgrading you must change your wifi. If your TL- WDR4900 v1 router is not working as it should, dropping connections or not being responsive, you should first do a reset of the router to see if the problems persist. Some official firmware of TP- Link products can be replaced by the third party firmware such as DD- WRT.TP- Link TL- WDR4900 drivers are tiny programs that enable your Wireless Router ( WiFi) hardware to communicate with your operating system software. Dec 31, · Hey Guys, Today I' m gonna guide you how you can upgrade your Tp- link Router Firmware to latest Version. Jun 12, · TP- Link WDR4900 firmware recovery by TFTP.