@Joseph-TP The firmware is 3.0.1 — shouldn't it say 1.2.0?

  @Alamtfm 

Hi,

How did your Archer C60 get that firmware version "3.0.1 Build 20190524 rel.42895"?

In your first post you mentioned something about the router being bricked. In case you installed that firmware by uploading a file to the Archer C60, can you please share the link you downloaded the firmware file from?

  @woozle Thanks for reply.

In this link: https://static.tp-link.com/2021/202101/20210118/Archer%20C60(US)_V3_201231.zip

  @Alamtfm 

I was actually asking about the *.bin file you used to un-brick the router, not the one you tried to load later via the GUI.

Anyway, I seem to have located the source of that "3.0.1" firmware here
https://forum.openwrt.org/t/help-in-unbricking-tp-link-archer-c60-v3/62642/25
That person manually modified the version string inside the *.bin file from TP-Link's 1.x to 3.x to fool TP-Link's version check and thus allow the firmware upload to succeed.

The thing is, since your Archer C60 V3 now thinks it has a firmware version number of 3.x there is no way to easily install a version with a lower major version number now.

If you want to update your C60 V3 to the version "1.2.0 Build 20201231 rel.39772" you provided the link for, then I think you would need to modify the version string inside the *.bin file to something like "3.2.0 Build 20201231 rel.39772" and also recalculate the file's checksum, like the person in that forum said he did.

  @woozle Load that same firmware to unlock it 

Alamtfm wrote

  @woozle Load that same firmware to unlock it 

  @Alamtfm