I have a rooted S3 with Axis ROM on it, and lately it's been not reading my SD card then suddenly it would not boot past the lockscreen (which was unusable). So I factory restored it via CWM v 6.0.1.5 thinking I could simply reflash, but I am unable to mount my Ext_SD for some reason on my computer or my phone. So now I'm stuck with a $600 paperweight that only goes into recovery or download modes and shows no option for USB Mass Storage transfer. I'm not too familiar with sideloading but I REALLY need some help.