I have a TP- Link XX530V v1 router / GPON.

I have upgraded it twice since I bought it but the version on the foot of the Web Interface remains unchanged.

I get no error message whatsoever when I upgrade It, but the version displayed on the web interface won't change. How can I be sure that the update really worked?

It shows:
Versão de firmware:0.6.0 3.0.0 v6096.0 Build 250313 Rel.6835n Versão de Hardware:XX530v v1.0 00000001

Even though I have upgraded to  XX530v v1 Build 250606 whic is the second latest version. And if i Try to upgrade to the latest version ( XX530v V10.8.0 3.0.0 v6096.0 Build 250902 Rel.11455n) only then I got an error message. 

What is wrong with my device? Shoud I ask for technical support?