Strange Problem WIth Lenovo

Hello Guys i am From Bulgaria Sorry for my Bad english my problem is i have lenovo s820 Work Perfectly on 4.2.1 Version but one day he update 4.4.2 and menu was Chinese Language and Keyboard and Not have Google Play i download Stock Rom 4.2.1 From official Website but problem is When i connect phone Computer not have sound when Phone is connected and not show in device manager nothing just phone show baterry is charging i soft Reset 2 times not work Clean charge place not work Then i Root Phone With Kingoroot and i flash Twrp Recovery Then Phone Restart and not show nothing only black Screen and low Light not show Lenovo Logo no sound when i try to flash With Sp flash Tool just phone is not detected.. i Try Recovery Menu but he have only this settings Reboot,Install Package Update wipe user data, Power Off When i click on install package Update and show me Now system Will install Update.zip of Root Directory and i Press YES and i have error this install failure i cant use Flash Tool becouse my PC not Detecting Phone i try on other computer 5 diffrent cables but not work Please help meee

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