I didn't realize my wireless router is more than 1 year old now. I bought it July last year.
Since I bought my HomePlug I was using the wireless router as a hardwired router. Friend of mine said why don't we swap, I said OK.
I now have a TP-Link R410 a very old model. I didn't have the original manual but managed to find a similar one to know how to reset it to factory default. It works at last after a few trials.