[Guide] Unlocking the Mi4c Bootloader without verification by Xiaomi

[yarixa]

Upgrad from MIUI 8 to CM 13.1 !

Thank you!
After upgrading Mi4C to MIUI 8 (which is a disaster) i was not able to unlock the bootloader and was not able to downgrade. Xiaomi unlock tool got stuck at 50% and I was not able to progress for 2 weeks.
This guide resolved my issues. I've installed CM 13.1 finally!!

 

[Monnq]

Does it still work on MIUI8? Can I brick my phone with this?

 

[clarify]

Mi4c Bootloader Unlock Guide

New to Android (iOS + OS X) and I have to say, although it is well-organized :good:, I do not find this to be a particularly comprehensive, STEP-BY-STEP guide for me.
I do understand bits and pieces of it, but more specifics would be incredibly helpful - I cannot tell, for example, if you are using a PC or not ('exe' file in 'Requirements').
Am planning to purchase a Xiaomi Mi4c phone shortly, with the hope of eventually flashing a CM Nougat-based ROM (firmware) onto it.
And I would like to be able to do it, using the phone only (no access to a PC), so a more elaborate guide would be truly appreciated!

Thank you!

 

[Monnq]

New to Android (iOS + OS X) and I have to say, although it is well-organized :good:, I do not find this to be a particularly comprehensive, STEP-BY-STEP guide for me.
I do understand bits and pieces of it, but more specifics would be incredibly helpful - I cannot tell, for example, if you are using a PC or not ('exe' file in 'Requirements').
Am planning to purchase a Xiaomi Mi4c phone shortly, with the hope of eventually flashing a CM Nougat-based ROM (firmware) onto it.
And I would like to be able to do it, using the phone only (no access to a PC), so a more elaborate guide would be truly appreciated!

Thank you!

He is using Windows

 

[mesziman]

These 2 commands are perfectly enough

Reboot into fastboot mode (Power + Vol Down)
Command: fastboot oem unlock -> at this point you should have an unlocked bootloader

 

[Shrapnel2]

Massive thanks to the OP for this. Recently got a Mi4C and the ram management in MIUI is so irritating, Cyanogen Mod is much better. I did this from step 2 coming from 7.5.4.0 which is the latest available version on MIUI for this phone, worked like a charm.

 

[Tantomare]

Does it still work on MIUI8? Can I brick my phone with this?

"fastboot oem edl" working confirmed on 6.8.25.

I had an issue at next step "Use MiFlash to flash 6.1.7 image", when Miflash couldn't open COM-port.
Unfortunately I can't find topic on miui.com with similar questuin, but latest Miflash beta-version resolved this problem.

All next steps passed fine.

 

[SH1M4BD3]

"fastboot oem edl" working confirmed on 6.8.25.

I had an issue at next step "Use MiFlash to flash 6.1.7 image", when Miflash couldn't open COM-port.
Unfortunately I can't find topic on miui.com with similar questuin, but latest Miflash beta-version resolved this problem.

All next steps passed fine.

try different port, restart your pc (on your case pc didn't recognized the QHSusb 9008 mode), reinstall miflash, disable driver signature on Win8 above

 

[Schatten777]

Hi, I tried to follow your guide, but unfortunately I'm already on MiUi 8, 6.9.1, China Developer Rom. The problem is, when ever I wan't to flash with MiFlash to Rom 6.1.7 (or any other Rom, same thing), MiFlash shows an error after a while: "ping target failed". Up to this point everything works, but I can't flash my Mi4C... what can I do?

Thank you!

//EDIT: Solved the problem for myself: Just use MiFlash Beta, instead of the normal version! Then the flashing works perfectly!!!

 

[dimipage]

fastboot oem edl works also with Developers Rom MIUI 8 Version: 6.8.25

 

[khalifaardi]

its not working

i already follow all the steps from 1-4 (including downgrade my rom into 6.1.21)
the command (fastboot oem edl) has working and the phone screen turn black, i open my miflash and its recognize my phone
but when i have chose the fastboot image and flash it, it says "ping target failed"
can any one give me some clue what should i do?
even i already ask for permission legallty to unlock the bootloader, its not gonna easy because my rom right now (6.1.21) is not developer mode. so what i should do?

 

[phonixmalik]

Imposible to unlock bootloader

hi
i've try every methode to unlock bootloader and unfortunatly

the same when i try to put my device on manufactured statue using fastboot oem
updating with mi home it stops at 50%
ive forgotten my mi account or there is another problem cause when i try with oficial solution it says that my account is not the same in my device and bloc at 50% too...
someone could help me please

as regards:good:

 

[Kan_narhio]

One more here that sucessfully unlocked Mi4c bootloader!

Only thing I did different from this tutorial, as someone already mentioned, was using MiFlash beta. MiFlash was returning the "ping error".

Before the process I had V7.1.4.0.LXKCNCK installed.

Thank you wolkenjaeger!

 

[bonz_zzz]

dear fellow mi4c users,

is it possible to have internal storage partition into 2 ? so i could have 1 "internal storage" that could be wiped when i clean installed new rom and 1 "external storage" that no need to be wiped when installed new rom?

I tired of copying my data (10gb) to otg first everytime i installed new rom

many thx

 

[sixtheninth]

hardbricked through attempted unlock

Perfect, Step 1 has hardbricked my phone into -not charging - not even starting phone. I tried to fast-boot and flash from MIUI 8. Now I am ****ed.

- now my phone won't even start despite MiFlash reported a successful flash operation, but after initial reboot brought me back into MIUI 8 (so no downgrade actually happened) ... then I powered it off and phone went dead - no boot, not even charging LED fires up anymore---any advice?

Cheers

Six

 

[flor90]

I used your guide, and I managed to flash cm13.1 successfully. One thing though, after unlocking bootloader, I didn't know the key combination for booting in recovery mode, MIUI booted instead and replaced the TWRP with MI recovery, so I did this: instead of long pressing power button after flashing TWRP, I used the command fastboot boot recovery twrp.......img. Maybe you could add this step to make it easier for anyone. Thank you very much for this thread!

 

[ramilkaxd]

From latest China Miui 8 to CM 13

The method is succesfully working for the latest China Dev Miui 8 6.9.15, i have just installed CM 13, TY VERY MUCH!!!
I did it from the second step, using mi flast from the author post

 

[wingsoflight]

I was not sure, if I could use the "fastboot oem edl" command in a higher version of MIUI.

perfectly works on MIUI 8.6.9.15 developer ROM

 

[schachi92]

Worked fine! Was on MIUI 8.0.16.0 before, Shop was banggood.
A few additions:

- Make sure driver signature is off, else miflash won't work in EDL mode:
Press (Win) + (X) and enter following:
BCDEDIT –Set LoadOptions DDISABLE_INTEGRITY_CHECKS
(Enter)
BCDEDIT –Set TESTSIGNING ON
(Enter)
Reboot your Windows.

- ADB DriverInstaller didn't work for me, use "15 seconds adb installer 1.3.0" (somewhere mentioned above or google)

- Place the fastboot and adb files directly in a folder on C:, not on dekstop or somewhere else.

- Use miflash beta. Make sure when in Phone is in EDL mode that it is listed as COM Port in device-manager. If not try to install this driver:
https: //mega. nz/#!Xs1iBYiR!gAlBltQW_M8aA83MLHa-V6zV5oFQvLm-p2_OxWEWV_E (64 Bit)
https: //mega. nz/#!Ko1BRCRS!PcQepjyvM40gKHUmM9ykyItw13dYrOhLkZIYp0hZkTg (32 Bit)
Sadly I'm not allowed to post links.

Good Luck!

 

[westernise]

Worked fine! Was on MIUI 8.0.16.0 before, Shop was banggood.
A few additions:

- Make sure driver signature is off, else miflash won't work in EDL mode:
Press (Win) + (X) and enter following:
BCDEDIT –Set LoadOptions DDISABLE_INTEGRITY_CHECKS
(Enter)
BCDEDIT –Set TESTSIGNING ON
(Enter)
Reboot your Windows.

- ADB DriverInstaller didn't work for me, use "15 seconds adb installer 1.3.0" (somewhere mentioned above or google)

- Place the fastboot and adb files directly in a folder on C:, not on dekstop or somewhere else.

- Use miflash beta. Make sure when in Phone is in EDL mode that it is listed as COM Port in device-manager. If not try to install this driver:
https: //mega. nz/#!Xs1iBYiR!gAlBltQW_M8aA83MLHa-V6zV5oFQvLm-p2_OxWEWV_E (64 Bit)
https: //mega. nz/#!Ko1BRCRS!PcQepjyvM40gKHUmM9ykyItw13dYrOhLkZIYp0hZkTg (32 Bit)
Sadly I'm not allowed to post links.

Good Luck!

I GET FOLLOWING ERROR MESSAGE - PLEASE HELP

C:\WINDOWS\system32>bcdedit -Set TESTSIGNING ON
An error has occurred setting the element data.
The value is protected by Secure Boot policy and cannot be modified or deleted.

---------- Post added at 02:47 PM ---------- Previous post was at 02:42 PM ----------

i get following error message - please help

c:\windows\system32>bcdedit -set testsigning on
an error has occurred setting the element data.
The value is protected by secure boot policy and cannot be modified or deleted.

i need to unlock my mi4c bootloder to flash cyan - my current rom is miui 8 [6.9.22 beta]
i am at my wits end. Have tried everything.
I would welcome any assistance. Am having some difficulty with following this tutorial. Keep getting error message as above when trying to set testsigning on. Have tried to unlock bootloader using official method but get stuck at 50% - account not linked message or something like that. Have been trying to unlock bootloader for over a month now so any help would be very greatly appreciated. Sorry for the caps.

---------- Post added at 02:53 PM ---------- Previous post was at 02:47 PM ----------

i get following error message - please help

c:\windows\system32>bcdedit -set testsigning on
an error has occurred setting the element data.
The value is protected by secure boot policy and cannot be modified or deleted.

i need to unlock my mi4c bootloder to flash cyan - my current rom is miui 8 [6.9.22 beta]
i am at my wits end. Have tried everything.
I would welcome any assistance. Am having some difficulty with following this tutorial. Keep getting error message as above when trying to set testsigning on. Have tried to unlock bootloader using official method but get stuck at 50% - account not linked message or something like that. Have been trying to unlock bootloader for over a month now so any help would be very greatly appreciated.