How to use ESP8266 Pin D3 / GPIO 0 and D8 / GPIO 15 properly I am using WeMos D1 Mini Pro to control multiple relays. I found out that during start up the relay connected to pin D3 and D8 would switch between on and off a couple times in a very short interval. I found out that the two pins are related to boot loader configuration.

Question is: Is there any way to prevent the relay from "blinking"? Is there a way to disable the relay output until boot loader finish it's stuff? Because this behavior only occur once every boot up.
A 74HC244 can be used to buffer up to 8 outputs and isolate them at will from the ESP8266. It can also be used for inputs as well if you connect gates the other way around. One additional IO line is required to control it.