Pls help lumia 900 rm-808 flashing error

[hopebay]

Windows Phone Flashing Started

AMSS File Found:
RM808_12w31_prod_generic_amss.esco
ADSP File Found:
RM808_12w31_prod_generic_adsp.esco
WPOS File Found:
RM808_12310_prod_220_02_boot.esco
MDM AMSS File Found:
RM808_12w31_prod_generic_mdm_amss.esco
MDM DSP1 File Found:
RM808_12w31_prod_generic_mdm_dsp1.esco
MDM DSP2 File Found:
RM808_12w31_prod_generic_mdm_dsp2.esco
USER AREA ERASE File Found:
RM808_12w31_prod_generic_user_area_erase.esco
WARNING: OSBL File is not Loaded

================================================== ====
Windows Phone Lumia Flasher
================================================== ====

If the Phone is ALIVE
1. Power On the Phone and Connect it to the USB Port

If the Phone is DEAD
1. Press and Hold the VOLUME UP button
2. Connect it to the USB Port while still Pressing
the VOLUME UP button
3. Continue to Press the VOLUME UP button for 8 more
seconds
================================================== ====

Switching to NOKIA MODE [NCSD]
Polling Ports... (Please Wait)

================================================
Basic Phone Information
================================================
SW Version : 2175.1000.8112.12082
IMEI Plain : 359746040794708
HW Version : 112.1914.2.0
Phone Type : RM-808
Product Code : 059M7R4
Basic Product Code: 059M7R2
Module Code : 0205047
PSN Number : MRE524349
NCSD Version : 1.9
Variant Information: VAR ATT CYAN

================================================
Extended Phone Information
================================================
Public ID : D192C0AD1E5EB70821AAF6D17046F736
Wireless Lan ID: A0:F4:19:59:AB:1C:00:00
Bluetooth ID : A0:F4:19:59:0F:5D:00:00:00:00:00:00

Rebooting to OSBL MODE

Sending AMSS Certificate
HASH: 71EBC4BD8D7EFA59DC22465E93DE6E0FD2BB8207
Certificate Size: 449 Bytes

ERROR: Data Rejected at SEQ 0x3
Status : WRITE AMSS CERTIFICATE FAILED