ORIGINAL POST

https://community.tp-link.com/en/home/forum/topic/151501

=========================================ENGLISH... BELOW IN PORTUGUESE=========================

(sorry for my bad english) To help anyone who has this problem of error 5533 for updating to the latest firmware in the USA and not being able to go back to the European firmware .... I got in touch with TP-LINK's own support and I will go step by step how to do it. .. come on:

1 - download the archer c9 TP-LINK test firmware so that you can release the European firmware application and other firmware back on your router following the link from the tp-link support itself

main link:

http://support.tp-link.com/f/e918e5badc

or from this mega or 4shsared link if the above link is no longer accessible

bakup link:

https://mega.nz/#!UdJnVQSR!3aoP5lIZ-y0QjNzyCD-JaYvpsyc-ftvE2c_oVBMcBP4

https://www.4shared.com/file/bdtQmsHbfi/c9v1_un-up-ver4-1-0-P312016051.html

this version above is the c9v1_un-up-ver4-1-0-P12002[20180223-rel35954].bin

that is in this link above (it is a test version that you will have to apply in order to release your router so that there is no more error 5533

after that done, download the most current European firmware and reinstall again in this link

https://www.tp-link.com/en/download/Archer-C9_V1.html#Firmware

The most current date of this post is the version -------     Archer C9(UN)_V1_160517

After updating with the latest firmware Archer C9 (UN) _V1_160517 and restarted your router restore it TO THE FACTORY STANDARD.

ready error 5533 problem solved 

================================ORIGINAL IN PORTUGUESE=======================================

Para ajudar quem teve este problema do erro 5533 por ter atualizado para o ultimo firmware dos USA e nao conseguir voltar para o firmware europeu.... eu entrei em contato com o suporte da propria TP-LINK e passarei passo a passo como fazer... vamos la:

1 - baixe o firmware de teste da TP-LINK do archer c9 para que possa liberar no seu roteador a aplicaçao do firmware europeu e outros firmware de volta segue link do proprio suporte da tp-link

link principal: 

http://support.tp-link.com/f/e918e5badc

ou deste link do mega ou 4shsared caso o link acima nao esteja mais acessivel

link reserva: 

https://mega.nz/#!UdJnVQSR!3aoP5lIZ-y0QjNzyCD-JaYvpsyc-ftvE2c_oVBMcBP4

https://www.4shared.com/file/bdtQmsHbfi/c9v1_un-up-ver4-1-0-P312016051.html

esta versão acima é a c9v1_un-up-ver4-1-0-P12002[20180223-rel35954].bin que esta neste link acima (é uma versao de teste que você tera de aplicar afim de liberar seu roteador para que nao de mais o erro 5533

apos feito isso, baixe o firmware mais atual europeu e reinstale novamente neste link

https://www.tp-link.com/en/download/Archer-C9_V1.html#Firmware

o mais atual ate a data desta postagem é a versao  -------     Archer C9(UN)_V1_160517

apos atualizar com o firmware mais rescente Archer C9(UN)_V1_160517 e reiniciado o seu roteador restaure ele PARA O padrão DE FABRICA. 

pronto problema do erro 5533 resolvido