[Q] stuck on Sony log after unroot , region changed and flashing US newest version

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http://forum.xda-developers.com – My tablet S stuck on Sony logo since I flash US firmware after I 1.rooted by S.onyTablet.S [ALLinONE] v6.5 2.region changed from “5 China”to be “26 US” 3.custom ROM and flashing “US firmware” My laptop now can’t load any tablet s device driver (Windows 8.1 64bit and Windows 7 64bit) and Tablet S always stuck on Sony logo , I also tried to “update system from SD card.” by all version I downloaded . same problem always ! Help ~ Help ~ Help~ And advice ? I bought my tablet S in China when I worked there , Version : China 4.03 r5 Model : SGPT112CN/S Android system (HowTos)