Turned My Note 3 Pro Into Paperweight

Oct 4, 2015
Need some help guys, went back from global to early Rom on the miui site, now does not recognise sim and plays up terrible, tried to update via the mi manager fails at 52%.

My first snapdragon phone, I am used to the mtk and SP flash tool, how can I take this back to no Rom and reinstall new rom like the spflash tool system....or any other advice cheers