[HELP] can't flash bootloader and modem G920FXXU2COI5 (G920F) - Galaxy S6 Q&A, Help & Troubleshooting

i want to flash bootloader and modem G920FXXU2COI5 (g920f 5.1.1) but it show error in odin..
is it posible to downgrade bootloader and modem coz my current bootloader and modem is G920FXXU3COI9 (g920f 5.1.1) ...

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Motorola Moto G - Flashing stock failing with fastboot

Hello everyone
I am new here.
I need some assistance with my moto g.
I previously unlocked my Moto G's bootloader but realised that I just wanted it on stock and locked so I didn't damage it, so I managed to relock my
phone's bootloader and got it back to a stock rom.
After installing a system update a few days ago, my phone came back with the
"Warning - bootloader unlocked!" logo after installing a system update.
So I decided to try and reflash the stock firmware and original logo.bin from the XDA Site.
However, my flashes are failing and my moto g is stuck in a bootloop with no rom to boot up to, I have adb minimal fastboot and motorola drivers
/ adb drivers installed.
What happens: I power on the phone into bootloader mode, then I try to flash the ROM I got from droid-developers site, but whenever I try to relock
my bootloader it shows the following:
...
Ready to flash signed images!
OK: (time)
I do fastboot flash partition gpt.bin and I get:
Preflash validation failed!
SST lock failure!
Also trying to issue the command to relock the bootloader gives me
SST lock failure!
I get other errors too when flashing the sparsechunk images, it gives: Invalid PIV signed image! and for motoboot and boot images it gives: Preflash validation failed!
version downgraded for boot.
etc
I cannot recover my stock rom due to these errors, I've searched everywhere (on google) and here and I am desperate to flash the stock rom back and relock bootloader again so I can use the phone.
I am really stuck and my phone will not get out of a bootloop
Any help is really much appreciated as I need to get my phone working so I can use it
You don't need to relock the bootloader. Just follow this tutorial:
http://forum.xda-developers.com/showthread.php?t=2542219​
lost101 said:
You don't need to relock the bootloader. Just follow this tutorial:
http://forum.xda-developers.com/showthread.php?t=2542219​
Click to expand...
Click to collapse
I followed the tutorial, but when I get to the flashing stage, I get:
Preflash validation failed,
SST lock failure!
And version downraded for gpt.bin
it seems to be failing to flash these files.
What do I need to do?
You need to provide more information for people to help you. Have you upgraded to 4.4.4?
I had a similar issue when rooting my phone, and all I had to do was unplug the phone from the computer, restart the phone and computer, and then try again.
GrammarNazi said:
I had a similar issue when rooting my phone, and all I had to do was unplug the phone from the computer, restart the phone and computer, and then try again.
Click to expand...
Click to collapse
But did you downgrade from 4.4.4 to 4.4.2?
What model do you have?
Can you explain us all the steps?
Thanks
First unlock your bootloader again. You have to downgrade from 4.4.4 to 4.4.3 then to 4.4.2. During the downgrades you have to follow the same kind of firmware (example: 4.4.4 retail EU -> 4.4.3 retail EU -> 4.4.2 retail EU). When you're done if you want you can relock the bootloader.

Modem question..

Hi, when we flash a modem do we have to flash the associate bootloader or it's not necessary??
Boot loader and modem are not linked.
You can do what you want.

Can i flash G920F's Bootloader and Modem on my G920W8?

Can i flash G920F's Bootloader and Modem on my G920W8?

Help, can't flash stock LP, stuck on fastboot

i get this error http://imgur.com/a/zHuOz , iam following this guide! http://forum.xda-developers.com/2015-moto-g/general/guide-fastboot-flashing-factory-t3187750 to downgrade to LP from MM.
All the commands sends out (okay) except this one, and now iam stuck in fastboot.
i had LP 5.1, then updated to 6.0, and unlocked the device now so i can flash the stock LP back..
joey_W said:
i get this error http://imgur.com/a/zHuOz , iam following this guide! http://forum.xda-developers.com/2015-moto-g/general/guide-fastboot-flashing-factory-t3187750 to downgrade to LP from MM.
All the commands sends out (okay) except this one, and now iam stuck in fastboot.
i had LP 5.1, then updated to 6.0, and unlocked the device now so i can flash the stock LP back..
Click to expand...
Click to collapse
You have to remove the following commands:
Code:
fastboot flash partition gpt.bin
fastboot flash bootloader bootloader.img
Srry for my english.

[Q] How to unlock bootloader for SD617?

I has SD617 phone (China Mobile [CMDC] Model A2 (M636T) android 6.0.1 kernel 3.10.84). I can not unlock bootloader. I tried fastboot flash patched boot image from magisk manager but got FAILED (remote : unknow command). I would like to root mine.
Any advice for me?

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