There is only one way what i know my friend:
First install on your phone a vpn with a connection to usa (new york or so)!! That's the most important step!
If that is really on the vpn and you have checked on a whatismyip website where you are located, it must show usa ofcourse and sometimes a city!!!
City must be in USA! SO NOT IN CANADA!!!
Second: buy a NEW formuler box on usa website if old box not work due block. But try first old Z11 please what you now have please!
DON'T PLUG IN A ETHERNET CABLE!!
IF IT ASK FOR WIFI: MAKE FROM YOUR PHONE (WITH VPN CONNECTION TO USA) A WIFI HOTSPOT!! If you dont know how ask or use Google. Free vpn's enough.
Connect your box to your phones wifi (which is connected to usa, what you checked before)
Afther wifi connection follow steps and update device only.
If software/firmware update is done by the box it should reboot itself.
After reboot box it should automatic take your phone's hotspot wifi (with vpn to usa)
Then it should be fine. Download from Formuler market app (Green logo with white trolly) the app: "Soundoptimzer" and install and run it once it click on LOAD!
Box reboot again after sound optimizer installed and loaded.
Then you should disconnect wifi hotspot.
And use own wifi or way better: an direct ethernet cable from router to box.
P.S: don't know if it works at blocked box or only at new formuler box from USA.
(Try first on old box, before you send it back!)
If you tried it on your box you have now, and it won't work.
Send it back!
Buy new one from official store who sell usa boxes. (Or a european box, but connect your vpn then to an european city like amsterdam, brussels, berlin etc. But NO UK city due it's not at europe)
And then before turning on the new box...
...first install a vpn on your phone and connect to usa!!!
Then create wifi hotspot from your phone (if VPN TO USA IS ON) and follow my steps above...
After all steps (firmware/software update and install audio optimizer) and a reboot you should disconnect your wifi hotspot and use your own wifi and should work...