g925f

i have 925f with imei and baseband null

i try to write firmware an i have this error:

Please put the phone into Download Mode and connect USB cable.
To put SM-G925F into Download Mode, You have to perform the following steps:
1. Reconnect the battery.
2. Press and hold "Volume-" + "Home" + "Power ON" keys.
3. When phone turns on, press "Volume+" key.
Found phone on
Firmware write started.
Writing BOOTLOADER section…
BOOTLOADER section has been written successfully.
Writing CM section…
CM section has been written successfully.
Writing BOOT section…
BOOT section has been written successfully.
Writing RECOVERY section…
RECOVERY section has been written successfully.
Writing SYSTEM section…
Writing Firmware Failed

always at 42%

best regards