Svetoslav: well the DIR-685 community isn't exactly happy with these bugs, so figure these patches may help.

stukka: Yes the router is working as normal, what I did:
1. Backup my settings into config.bin
2. Switched off all other devices
3. Use direct connection with Ethernet
4. Flash firmware
5. Restore To Factory Default Settings
6. Log in with no password and applied my settings config.bin.
I haven't notice any changes......