My phone's wifi disconnects automatically. At first I thought this was an issue with my phone but when the same happened with my dad's phone too then I thought maybe the issue is with the router. Thou

I am confused with the hardware version of my router. On the product box the version mentioned near the bar code is v6.20 but in the web interface the current hardware version is TL-WR840N v6 00000007

I have a TP LINK TL-WR840N. I need help for firmware selection for upgrade. On the router box the hardware version is mentioned 6.20 while in the router's admin page the hardware version is TL-WR840N