Download Asus Zenfone Go Mini Z00SD official stock rom from the link below and follow the instructions after download link to learn how to flash.
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File Name: Asus_Zenfone_Go_Mini_Z00SD_MT6580_4.4.zip
Size: 888 MB
Android version: 4.4
Firmware Link: Download
How to flash
After downloading the Flashtool firmware, follow the instructions here to flash.