The Voynich Manuscript as an Iberian-African Voyage Record

[Kaybo]

More context to African journey theory:
There are nearly no books left from the time of Henry the navigator today.

But in later books that mention the early roteiros it was always talked about books that were unreadable anymore, corrupted and therefore useless.


We have at least two sources that stated that:

„Crónica dos feitos da Guiné“ (Gomes Eanes de Zurara, ca. 1453)


"Décadas da Ásia“   (João de Barros ca 1552)

If those works are available online, can you please post a link, and a quote of the passages which support what you say? If they are not available online, can you please post at least the quotes? And a translation of the passages would be useful too.

Don't ask us to find and read two books in Renaissance Portuguese to be able to check, please. As it stands, what you affirm is little more than an argument from authority which almost noone can vet (I surely cannot), so it has a value of about zero. With proper links and quotes that might change.

For example: 
“E porque muitos destes escriptos são em letras antigas e confusas, não se podem bem entender.”
"And because many of these writings are in ancient and confused letters, they cannot be well understood."

(João de Barros, Décadas da Ásia, Década I, Prólogo; Lisboa 1552, f. A ii v.)

Digital copy of Décadas da Ásia (National Library of Portugal, Cota Res-266 P). 

You will find the passage right at the beginning of the prologue, where Barros explains that he consulted older “escriptos.” This is João de Barros explaining the difficulties he faced in consulting older documents and sources (including potentially roteiros - navigation guides, and other old manuscripts) when compiling his historical work about Portuguese activities in Asia. He was referring to the challenge of reading old manuscripts written in archaic scripts that had become difficult to decipher.