SM-G935F S7 EDGE CERT Write Incorrect IMEI signature Even after Patching Success

SM-G935F S7 EDGE CERT Write : Incorrect IMEI signature Even after Patching Success

Operation: Write CERT
Selected model: SM-G935F
Software version: 27.3
Waiting ADB device... Ok
Reading phone info...
Model: SM-G935F
Android version: 6.0.1
Product code: SM-G935XZKATTR
Phone version: G935FXXU1APBB
PDA version: G935FXXU1APB9
CSC version: G935FDAX1APB2
CSC country code: AUSTRIA
CSC sales code: TTR
HW version: MP 0.801
Phone SN: RF8H31RC88Y
Chip name: EXYNOS8890
Modem board: SHANNON335
RF cal date: 20160223
IMEI:
Checking Super user right... true
Reading NV data... Ok
Checking NV data... Ok
Initialization zTool... Ok
Running zTool, please wait...
Start... Ok
Initialization... Ok
Generate and check client proof... Ok
Verify proof by client... Ok
Reading data from phone... Ok
Modem board: SHANNON335
Calculating... Ok
HWID: 26 64 8C 96 EE 96 62 DF 22 B7 39 E4 A3 A2 B6 60
Initialization AT RIL...
AT RIL stopped, restarting... Ok
Checking for compatible phone and cert
Phone KEY ID: 0445
Checking certificate file... error
Incorrect IMEI signature
Done with Samsung Tool PRO v.27.3