sm-g531f dead after downgrade

hi
i succesfully connected g531f to medusa pro
after performin smart repair procedure..i have error writing boot partition.
i attach here logs.
any advices are welcomed.

Quote:

Welcome to Medusa Pro Software version 1.2.0.
Started.
Reader #0: Generic EMV Smartcard Reader 0
Reader #1: Generic Usb Smart Card Reader 0

Please disconnect battery and USB cable.

Selected device model: Samsung SM-G531F.
Selected file: C:/Program Files (x86)/Medusa Pro Software/firmwareFolder/SAMSUNG_SM-G531F_EMMC_P1J95K.srf.

eMMC interface selected.

Connecting…
Device : Hynix eMMC H8G4t!
Page size : 512 B
Block size : 512 B
Block count : 15269888
Size : 7.28 GB
——————————————————–
CID Info

CID : 90014A483847347421011740E51CC217
Manufacturer ID : 0X90
Device/BGA : BGA(Discrete embeded)
OEM/Application ID : 0X4A
Product name : H8G4t!
Product revision : 0.1
Product serial number : (hex)1740E51C
Manufacturing date : 12/2015
——————————————————–
CSD Info

CSD : D07F01320F5903FFFFFFFFEF8A400013
CSD structure : CSD version No. 1.2
SPEC version : 4.1, 4.2, 4.3, 4.4, 4.41, 4.5,
4.51, 5.0, 5.01, 5.1
Data read access time1: 80 ms
TRAN speed : 26 MHz
READ block length : 512 Bytes
WP group enable : YES
PERM_WRITE_PROTECT : NO
TMP_WRITE_PROTECT : NO
——————————————————–
EXTCSD Info

Revision 1.7 (for MMC v5.0, v5.01)
Boot1 size : 4096 Kbytes
Boot2 size : 4096 Kbytes
RPMB size : 4096 Kbytes
Boot partition enable : Boot partition 1

Partition config : 01001000
Backup EXT_CSD saved to file C:/Program Files (x86)/Medusa Pro Software/EXT_CSD Backups/H8G4t!_21_09_2016_14_34_05.bin.
Connect successful.
——————————————————–

Switched to Boot1!!!
Writting BOOT1 partition…
ERROR[012]: Write error.
At sector 128
Attempting to write…
Disconnected