@JhonneL take look here : https://community.tp-link.com/en/business/forum/topic/255784 same topic & same problem.....

@Fae I tried that, but it didn't help me. No matter which firmware I loaded .... it was always the same one that was on it before!

@Fae i waited more than 45 minutes for the update. i think that's enough time for an update. I tried that too, more and more times. unfortunately without success .... for me 1.) make a back up 2.)...

@Rickk10000 I would like to know if the update to 1.7.4 worked ? my config : OC200 V1, R605 V1, SG2210P V3.2 / update from 1.7.3 to 1.7.4 does not work = OC200 brick

@rickk1000 yes i have done the following. 1.) router R605 upgrade yesterday.... error comes as already described here...it no longer connects. Solution: disconnect the R605 from the power supply 2.)...

@Cyclups I have the same problem, then I wanted to go back to version 1.7.3. but that doesn't work either. the oc200 no longer works. regarding problem TL-R605, i have also had this bad experience....