need help relocking Sony Xperia G3121 - Android Q&A, Help & Troubleshooting

i once unlocked my Sony Xperia G3121 but now that i didnt make any changes to it i cant relock it. almost every fastboot command gives back an unknown command error
can you please help me with that?

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Xperia Z5 Compact: unable to unlock Bootloader (fastboot.exe: unknown option --i)

Hi everyone
I message you today beacause I've tried (nearly ^^) everything I could to unlock my Sony Xperia Z5 Compact's Bootloader, without any success!...
ADB actually find my Xperia, I rune:
Code:
adb reboot bootloader
and my Xperia goes right into Fastboot mod (blue led), confirmed by:
Code:
fastboot devices
but when I run:
Code:
fastboot.exe -i 0x0fce oem unlock 0x"my Sony unlock code"
the comand line answer back "fastboot.exe: unknown option -- i"...
I dug the web to find a similar case, without any success... did I miss something?
If someone has encountered this problem before, he'll be welcome to share is knowledges
It was the same here but I've tried with another fastboot.exe from another source, and it worked.
loosht said:
It was the same here but I've tried with another fastboot.exe from another source, and it worked.
Click to expand...
Click to collapse
I faced the same problem, but as @loosht advised, using different version of fastboot helped... I used this one: Minimal ADB And Fastboot V1.4.2

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