o3DS Downgrade error | Failed to get CIA file info

So, I'm trying to install 9.2 with sysUpdate 0.4.2 on my other 2DS [10.3.0-28U]
after putting the cia files in the updates folder at the root of the sd card, I went into sysupdater and so far every time I've tried updating, it tells me "Failed to get CIA file info"

Can someone please help?

Edit: I'm using MenuHax