I tested this code with "Gecko dnet" on my Wii U 5.5.1 and it works
Hyrule Warriors v1.9.0 [PAL/Disk]
9 999 999 Rupees
3560F8E4 0098967F
999 material
356234C4 03E7
356234C6 03E7
356234C8 03E7
356234CA 03E7
356234CC 03E7
356234CE 03E7
356234D0 03E7
356234D2 03E7
356234D4 03E7
356234D6 03E7...
I also have strange effects with .cht file, for example, Zelda Minish Cap, when I activate the code "999 Rupee" in the games I have 3 Rupee
And I found a solution in this link
(translated with google translation from French to English)...