@KidaT When looking for your HW version the following rule applies: Normally Vx.0=Vx.6/Vx.8 (eg:V1.0=V1.6/V1.8); Vx.x0=Vx.x6/Vx.x8 (eg:V1.20=V1.26/V1.28 So it's quite normal that these are the same...

@Staggoyo It would be best to describe what your local network looks like - what devices do you have, how they are connected to each other and how they are configured. Main router - make and model...

@KidaT If you open the BE800 US support portlal - https://www.tp-link.com/us/support/download/archer-be800/v1/#Firmware You won't see this FW release because it's a brand new - I assume you received...

@Yamshanks Upon successful restart your router should forget any customized password. The default router password is admin. Did you buy this router or it has been provided to you by an ISP ?

@KidaT That's just a suggestion because your FW version is not listed yet on the BE800 support portal. Which FW region your router is - you can check that on its bottom sticker.

@KidaT The error you're getting is most probably because you're not allowed to downgrade to a previous FW release from the curren one.