Downgrading back to firmware 5

I got sent a replacement Balance 30 with firmware 6.1, I keep having issues with the heath check saying that my connection has gone offline, when it has not.

I did not have this issue with my previous router with firmware 5.

I can not see any benefit staying on 6.1 as you still have not included the WAN by time. How do i downgrade back to 5 to check if its the router or firmware?

Firmware 6.1 does not have any issues with the health check mechanism, I suggest to open a support ticket and we will help you troubleshoot: