Remove VirtualHere from TL-MR3020

Hello,

I installed VirtualHere on a TP-Link TL-MR3020 V1 and now since I bought another device (GL-MT 300 V2) I would like to remove VirtualHere from my MR3020 and install the original software back (or openwrt). How can I do this?
I already tried from properties->configure-> advanced->update firmware but it didn't work. A pop-up window says that the image will now be written and the device will restart but nothing happens.
Could you help me please?

#3

thank you very much!
I was able to flash it with dd-wrt and then to the original TP-LINK build.