help me plz about lenovo k920 ch version

hi
i have lenovo k920 china version (logo of china mobile in the back of it)
i try flash a frimware with lenovo recovery and it installed
after that
my phone was hang on lenovo logo and not boot
or its better to say in fastboot mod
i can flash lenovo frimware files but i cant flash twrp or philiz touch and ...
i think its for bootloader loked problem but when i want to unlock bootloader
it show me a error in qfil programe

" Download Fail:QC.QMSLPhone.PhoneException: Could not connect to the COMPORT
at QC.QMSLPhone.Phone.ConnectToServer_Sahara(UInt32 comPort, UInt64& version, Int32 mode, UInt64 timeout)
at QC.SwDownloadDLL.SwDownload.QPHONEMSSaharaDownload ArmPrg(UInt64& version, String armPrgPath)
Download Fail:Sahara FailValue cannot be null.
Parameter name: key
Finish Download"
someone can help me?:rolleyes::rolleyes::rolleyes::(

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