Redmi k20 flash faild

[kothamamun]

 Searching for Qualcomm 9008 Device...Found
 FriendlyName :Qualcomm HS-USB QDLoader 9008 (COM51)
 SymbolicName :\??\USB#VID_05C6&PID_9008#5&3478949&0&2#{a5dcbf10-6530-11d2-901f-00c04fb951ed}
 Driver Ver   :07/08/2015,2.1.2.0

Getting device info......
Serial No.: 0x596FD5CE
HW_ID     : 000E60E100720000
MSM ID    : 0x000E60E1, SM7150-Qualcomm Snapdragon 730
MODEL_ID  : 0x0000
OEM_ID    : 0x0072 - XIAOMI
PBL Ver   : 00000001
PK HASH   : 1bebe3863a6781db4b01086063007334de9e5ca14971c7c4f4358ec9d79cda46

Hydra Enable Auto search Firehose..
 #Please wait...
 #Search by filename filter.....
 #Found 11 Compatible Files..Found match Firehose...
 
Firehose Loader[000e60e100720000_1bebe3863a6781db_0a258a11_xiaomi_auth.fhprg]
--------------------------------------------------
  Header Type    : New
  TargetMSM      : 
  Tag            : _auth
  Version        : 6
  Code_size      : 816
  Signature_size : 256
  fhVendor       : XIAOMI
  HW_ID          : 000E60E100720000
  Vendor         : XIAOMI
  OEM_ID         : 0072
  MODEL_ID       : 0000
  SW_ID          : 00000003
  APP_ID         : 00000000
  pk_hash        : 1bebe3863a6781db4b01086063007334de9e5ca14971c7c4f4358ec9d79cda4692ce5e948c6fd409408f4c919fcadfe3
  OEM_VERSION    : c4-miui-ota-bd20.bj
  IMAGE_VARIANT  : SDM7150LA
  QC_VERSION     : BOOT.XF.3.1-00172-SM6150LZB-1
--------------------------------------------------

SaharaBoot... Ok
Sending ..................................Ok
Connecting to Firehose...
Ping..................... Ok 
Configuration.
Xiaomi Authentication needed...
Signature Request -> bob[wh58EQ15wU3epDD5jMI3BC0z4
Signature @256bytes Authentication.... Denied..
ERROR: Signature Verification Failed.
Running : Failed
Device is not in Firehose Mode

Elapsed Time : 00:00:43