Error "Can't verify update" after update manually

Hello all,

I recently puchased a mi5 standaard and it is full of bloat- and adware, so i wanted to reflash the MIUI ROM from their website.
I tried the Chinese devolpment ROM and the global stable but they both don't work. I copy them to interna storage, open update app, choose update package and then i select the zip file.
I get the error popping up "Can't verify update", and yes i'm connected to WLAN.

Thanks!

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