just received an answer from tp-link support... "I am sorry to tell you that we are not able to hard reset the device . According to the light ,I am afraid it may broken ." So, if you make an update...

Region : Greece Model : TL-PA210KIT Hardware Version : V1 Firmware Version : ISP : I have two TL-PA210 and due to speed problems i decide to make a firmware update. I connect to them with power line...

i have the same problem with powerline TL-PA210. after firmware update no response... The firmware was the original from TP-link site but created a problem... I send email to company but no answer!!!...