Is it correct?

[mijas1]

"Firstly, I was told that the walkman had manual in English but in reality
manual was in Russian. That is why I had many difficulties with using it."

[kylie1]

"At first, I was told that the owner's manual for the walkman was in English
but in fact the manual was in Russian. That is why I had many difficulties
using it."

:)

[ampolion]

That's why I had such a problem using it.