R6260-AC1600 Router does not work and it is just blinking Green power light.

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Eter2E wrote:

the internet function of the router was suddenly gone and it just keep showing blinking green power light after I rebooted.

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According to the manual, this can be a sign that "the router firmware is corrupted".

I don't know what this bit means:

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The internet and wire work properly without any problems.

How are you checking that these "work properly"?

First try a reset:

How do I perform a factory reset on my NETGEAR router? | Answer | NETGEAR Support

There is more severe, recovery reset, that you could try:

• Press reset for 30 seconds
• Keep pressing reset while removing power
• Keep pressing reset for another 30 seconds while apply power

If that fails, you are into TFTP country.

How to upload firmware to a NETGEAR router using Windows TFTP | Answer | NETGEAR Support

This isn't the easiest operation, so if you are forced to use it, you could try a web search to find videos that guide you through the process.