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Help can't install standard rom

hello there,

i've got a problem with my huawei ascend mate, i installed a custum rom but want to get back to my standard rom.
but when i put the update file on my sd card and start the phone with the volume up/down button holded, he tries to update but says my phone is "in lock state"
what can i do to get the original firmware on my phone?
 

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