Yes Im using O3DS US ver. when you say flash my emunand do you mean like reformat it using gateway (yes I've done that as well, still getting the black screen)? I'm sorry I'm not really that familiar on how you should do that.
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im using rxtools nightlies 2015-12-05.
I've got this weird issue when updating emunand. My sysnand is on 4.2 and so was my emunand. i've tried updating it (fw 9.9) using BBM and i always get a black screen after restarting rxtools. I've successfully updated emunand before using my 3ds and my friends 3ds with no problem. any thoughts...