what does it say under baseband? If you want some advice,This is from my experience i would flash a bin file using the Acer Download Tool found in this forum i would recommend flashing "4.002.14.EMEA.GEN1_A22F_A" as i found it has the best battery (my opinion) IF IT STOPS RESPONDING DO NOT PULL THE BATTERY !!! disconnect the usb cable then connect can take a little while, Once booted up then install malez recovery. When your done that put the miui zip on sd card and flash. When i installed MIUI the phone rebooted a few times then after a few minutes the phone will start up.
I really miss MIUI as i now have a SGS2 lte and its still in Alpha