After I flashed stock rom with this method "http://asus-zenfone.blogspot.com/2014/06/zenfone-downgrade-tutorial.html", i cant turn on my zenfone. when i connect to PC just stuck on usb logo, and then off again. i looking for solution on google for a view days, still not found how to flash a rom to zenfone 4. i use worldwide stock rom UL-ASUS_T00I-WW-18.104.22.168-user.zip, as i know my zenfone use WW stock room with lower version.
Asus uses a method of copying a zipped fw on the external flash drive, plugging it into the device, then hitting very special button combo (I think holding vol+ and power to turn on the device, but you have to google it). Thus you can flash a softbricked device with correct fw
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