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Question i heard something about bootloader un/relocking

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testask123

Member
Sep 27, 2020
34
1
is it true that relocking a unlocked bootloader erases everything, but you can re-unlock it ever again on xiaomi devices?
 

johnr64

Senior Member
Mar 27, 2021
51
15
Hi,
I am new Poco F3 owner,

I got the Amazon black Friday deal £50 off,

my variant has 8gb of rom & 256gb of ram, all this for £269.00p,

what an Amazing price and also comes with 2 years warranty here in the UK.


I have been a LG users for many years, using the (G2, G4, and for now a G7) .
I have installed many custom roms on these devices over the last 8 years.
Unlocking/locking there bootloader have been relatively straight forward.


I asking the same question that I am sure has been asked many times before,

once my 7 days are up and i have unlocked my bootloader and i then lock it again,

but then further down the line i decide to unlock it again,

do i have to wait another 7 pointless days.

I'm loving the new poco F3, apart from the firmware is a bit restrictive,

hence why I'm unlocking the bootloader.

What a great community the F3 has (y) (y) (y), long may it continue,

regards,

Johnr64:)
 
Last edited:

heinhuiz

Senior Member
Nov 26, 2011
994
638
Xiaomi Mi A1
Redmi K20 / Xiaomi Mi 9T
Hi,
I am new Poco F3 owner,

I got the Amazon black Friday deal £50 off,

my variant has 8gb of rom & 256gb of ram, all this for £269.00p,

what an Amazing price and also comes with 2 years warranty here in the UK.


I have been a LG users for many years, using the (G2, G4, and for now a G7) .
I have installed many custom roms on these devices over the last 8 years.
Unlocking/locking there bootloader have been relatively straight forward.


I asking the same question that I am sure has been asked many times before,

once my 7 days are up and i have unlocked my bootloader and i then lock it again,

but then further down the line i decide to unlock it again,

do i have to wait another 7 pointless days.

I'm loving the new poco F3, apart from the firmware is a bit restrictive,

hence why I'm unlocking the bootloader.

What a great community the F3 has (y) (y) (y), long may it continue,

regards,

Johnr64:)
No, you only have to wait the first time.

This waiting time is not so pointless as it seems however. It is there to discourage a.o. the many traders flashing (often fake) 'global' roms on Chinese phones and selling them as genuine global models for extra profit. So in the end it's only for your protection, because flashing roms invalidates warranty.
 
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user0u

Senior Member
Jun 14, 2018
62
18
Xiaomi Poco F3
To lock the bootloader you can simply use "fastboot oem lock" in fastboot mode. Note that doing so will (obviously) factory reset your phone.
 
Last edited:

testask123

Member
Sep 27, 2020
34
1
To lock the bootloader you can simply use "fastboot oem lock" in fastboot mode. Note that doing so will (obviously) factory reset your phone.

ok, another question:

in the event where i lose my phone an unlocked bootloader can bypass any password protection if they have the knowledge right?
is there any way to protect the phone from this?
 

user0u

Senior Member
Jun 14, 2018
62
18
Xiaomi Poco F3
ok, another question:

in the event where i lose my phone an unlocked bootloader can bypass any password protection if they have the knowledge right?
is there any way to protect the phone from this?
If you mean screen lock, yes they can bypass it. But they cannot get into your banking apps or others which have their own passwords.
If you are really keen on it, just lock the bootloader.
 

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  • 1
    there's no tool to re-unlock it? its forever locked?
    Just use xiaomi flash tool, as it can also re-lock your bootloader.
    1
    Hi,
    I am new Poco F3 owner,

    I got the Amazon black Friday deal £50 off,

    my variant has 8gb of rom & 256gb of ram, all this for £269.00p,

    what an Amazing price and also comes with 2 years warranty here in the UK.


    I have been a LG users for many years, using the (G2, G4, and for now a G7) .
    I have installed many custom roms on these devices over the last 8 years.
    Unlocking/locking there bootloader have been relatively straight forward.


    I asking the same question that I am sure has been asked many times before,

    once my 7 days are up and i have unlocked my bootloader and i then lock it again,

    but then further down the line i decide to unlock it again,

    do i have to wait another 7 pointless days.

    I'm loving the new poco F3, apart from the firmware is a bit restrictive,

    hence why I'm unlocking the bootloader.

    What a great community the F3 has (y) (y) (y), long may it continue,

    regards,

    Johnr64:)
    No, you only have to wait the first time.

    This waiting time is not so pointless as it seems however. It is there to discourage a.o. the many traders flashing (often fake) 'global' roms on Chinese phones and selling them as genuine global models for extra profit. So in the end it's only for your protection, because flashing roms invalidates warranty.
    1
    there's no tool to re-unlock it? its forever locked?
    xiaomi unlock tool its infinite dont worry, but be extreme cautious when you are locking your bootloader make sure your are in your right stock rom and dont forget to unlock again when you are going to flash custom roms and recovery