@Solla-topee My Deco M4 ethernet port also changed from 1000 Mbps to 100 Mbps after electricity came back. Everytime when electricity came back ethernet port speed changed from 1000 Mbps to 100 Mbps...

@Doma2018 You can use Recovery Mode to install the firmware from the link below. 👇 https://www.tp-link.com/us/support/faq/2958/

@Winded My Pleasure 💓

@Capmkwifi Deco M4R has 1000 Mbps ports. You can check again after using CAT6 ethernet cable.

@Winded Yeah exactly i used HTTP method which is recommended by TP-LINK for Deco M4 and uploaded 1.8.2 firmware.

@Winded Yeah i have reverted back by using Recovery Mode from the link below and yes mine is also Deco M4 V2. https://www.tp-link.com/us/support/faq/2958/