Does it happen every time after you turn off and on the power? Did you try manually push the reset button on the back of the router?

I don't know, but am curious if you turned it off with the power button on the back or by unplugging it?I do know someone else had this issue in another thread, so scroll down to see if you can find that one, though I don't think he got a solution. I hope you had your settings backed up!

Enson Loo wrote

Does it happen every time after you turn off and on the power? Did you try manually push the reset button on the back of the router?

no push the reset button , just only turn off power after 2 days , today is second 2 day i turn off power router self factory reset again.

Try this beta firmware if yours is a US version 170630
http://static.tp-link.com/Archer C5400(US)_V2_170801_beta.zip

Shield101 wrote

Try this beta firmware if yours is a US version 170630
http://static.tp-link.com/Archer C5400(US)_V2_170801_beta.zip

this can use for malaysia ? can you please check connect type got Malaysia Unifi or not , thanks.

The link to the beta firmware seems to be broken. Any chance you could provide a working link. Thanks!

Never mind I got the link to work. It looks like the forum inserts a * instead of a space "http://static.tp-link.com/Archer*C5400(US)_V2_170801_beta.zip" is where it directs you and the correct link is " http://static.tp-link.com/Archer C5400(US)_V2_170801_beta.zip". Deleting the * and going to it got it to download.

Unfortunately even with the beta firmware my router is still broken. Your mileage may very though.

after few day i try , i turn off and turn on power C5400 every day morning , I found it if you no login TP-LINK CLOUD the problem is gone , if you have login TP-LINK CLOUD the problem self factory reset come again.

kenhwa wrote

after few day i try , i turn off and turn on power C5400 every day morning , I found it if you no login TP-LINK CLOUD the problem is gone , if you have login TP-LINK CLOUD the problem self factory reset come again.

oh on , today i tyring trun off and on power again with no login TP-Link CLOUD , still facing self factory reset again , now i try firmware beta version V2_170801 and reply back after few day.

after update firmware beta version V2_170801 self factory reset problem is gone , but still have many bug , ( TP-Link CLOUD cant not , speed test cant not , no Statistical connection time , bla bla bla

This issue happens to me as well. Every time my C5400 loses power, it resets to factory defaults. VERY annoying.