could refer to this link to verify the hardware version of your router: http://www.tp-link.com/en/faq-46.html According to your description, it seems that you are using version 3, so the firmware...

You mean the wireless password for tplink re450's wireless network? by default, there is no password, if you finished configuration, the wireless password should be the same as your main router.

For the login issue, you could have a try to delete the cache data of your web browser, for chrome, press [control]+[H] to open the history page of the browser, then click "Clear browsing data". You...