@Nyamp 

1.3.6 beta ArcherC6v2_eu-up-ver1-3-6-P1[20200819-rel50735].bin doesn't solve my 2.4 GHZ problem, neither @RedIndianRobin's setting.

@Mare007 Friend think the European version with the flash memory of 8MB will not have solution, because it does not have enough space for a new firmware with fixes, just compare with the American version that has 16MB of flash memory, the last update came out in December 2019, and everything is working properly, I think the TP-link wanted to save by putting smaller flash memory and ran this problem , because it had to use a reduced firmware or contrary to the American version and this may have happened in the breakdown of the internal system encoding.

@Lucasm bug fixes usually don't take additional space. It is often the opposite - debugged code is more optimized and occupies less space.

... Yes, memory could be reason ..

@Wetterhahn I understood what you said, I have both versions (US) and (I) that has the same hardware but changes the size of flash memory, and the version (US) has more features, the problem is that there is no way to install the firmware version (US) in the version (EU) because of the size of flash memory, if you compare the firmware of the two versions the Americana had the last update at the end of 2019 , and as for the European version even with the last update did not solve the problem.

@Mare007 

I don't think so. If US and EU version were very different they would end up having different names... Does US version have very different menu, options etc. comparing to EU one? Both of them are also build based on very same hardware...

@Lucasm 

You can always try flashing your US version using EU firmware. Of course if you fill lucky... It should fit :) If it is not bricked after flashing - you could answer the very first question: is it firmware or hardware problem?

@Kubas As I have both versions and only The European presents the problem to me, I think that by having little flash memory, it will be difficult to solve the problem because there was implementation of new features that in previous summers of the firmware did not have.

@Mare007 The equipment comnotes the firmware and does not let urge, must have a verification code that validates the installation of the firmware, I think I should use some program or script that forces the installation.