Hello, I have been thinking of getting an R4S as my main router, however I'm a bit concern about the temperature, I know the RK3399 can get pretty hot. I also plan to store it in a drawer with virtually no ventilation, is it possible to use a fan on it? or is the cased version just enough to keep i...

Rockchip SoCs always have eMMC as a boot priority. So, to boot from SDCard, you need to stop U-Boot from eMMC by pressing <spacebar> several times during startup. Then, at the U-Boot command line, you can type "setenv devnum 1" followed by "run mmc_boot", it will then boot from S...