@TP-Link The Decos have been setup successfully. After a few days, one of the unit was not functioning and I remove it from the Network by using the Deco apps and resetup. Unfortunately, it is...

@TP-Link_Deco Tried your suggestion, but just after power on the Deco X60 (with holding reset), the light immeidately turned into stable green, and continue to lit up in green. Any alternative...