Can you unlock bootloader with the rom 26S? - LeEco Le Pro3 Elite (Model x722) Guides, Developme

Hello, the question is very simple: does anyone who has installed the rom 26S in x722 have been able to then unlock the bootloader or install another rom?
We know that in the rom 20S with the one that comes from the factory you can unlock the bootloader and install twrp, we know you can upgrade to the 26S, we know that there are people who have upgraded to 26S, but no one who has upgraded to 26S has Commented that it was able to install another rom then, only comment that the bootloader is blocked with the 26S.
All those who have updated to 26S you have to stay with her because you can not change?
Well if someone has succeeded, it would be nice to say how he did it.
Greetings.
*** TODAY, THE ONLY WAY TO LEAVE OFFICIAL 26S IS TO INSTALL THE ROM 01D, THAT UNLOCK THE BOOTLOADER AND ALLOWS US TO INSTALL ANY OTHER ROM. ***

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My phone came with 20s shoprom and the bootloader is unlocked. I checked. So I will wait for a twrp before I update to 26s. Is the x720 twrp compatible with our phone to flash?

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I have not tried it, but according to the comments of this and other forums, with the 20S factory version it is easy to unlock by ADB, and it allows you to install twrp from x720 which by comment works fine.
The problem is that if you upgrade to version 26S, the bootloader can no longer be unlocked and as the recovery is changed to the stock, you can not reinstall Twrp or any other ROM (I suppose you can install another official ROM, but The only one that exists is the 26S, there is not even the 20S with which it comes from the factory)
In short, if you upgrade to version 26S, the bootloader is blocked, and you can not reinstall twrp or anything that is not official, and for the moment there is nothing more.
Greetings.

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It's not like there are so many ROMs

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The bootloader changes in 26s and it makes device bootloader locked.
I would suggest to stay on 20s until a workaround is available for unlocking bootloader also on 26s.

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I guess anyone who already has the 26S version will have to wait. But for the one who has a hard-brick with the blocked bootloader should try to get a copy of bootloader of 20S and with some flash tool try to change it.
Also it could be that with a flash tool install the rom 26S and before restarting change the bootloader by the 20S version. In some terminals, this has worked.
Greetings.

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I have a nandroid copy of 20S Shop ROM boot. I made nandroid copies of all major partitions (the same ones that have stock ROM) before installing 26S Stock. I used the TWRP of the X722 version to install the ROM. Everything worked. Then I installed the GApps and gave it some error and rebooted. Now I have the bootloader locked, it does not go into recovery mode and it does not start the system. Totally brick.
And the worst: QFIL does not work here. I have tested on different versions, different computers, different drivers and nothing. He always gives this error:
Code:
15:47:28: ERROR: function: rx_data:247 Error occurred while reading from COM port
15:47:28: ERROR: function: sahara_main:924 Sahara protocol error
15:47:28: ERROR: function: main:303 Uploading Image using Sahara protocol failed
Download Fail:Sahara Fail:QSaharaServer Fail:Process fail
And Windows emits the disconnected device sound.
Here is a detailed log using the command to send the FireHose through the CMD:
Log.txt

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Does anyone have any idea what this error is? And how to solve it?

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Hello DK Boneco, I can not tell you how to solve it, but I can give you an idea.
The fault is because the bootloader is locked.
Look for another tool that does not use qfil and that allows you to flash with locked bootloader. Surely there must be some.
And by the way, if you have a copy of the complete 20S version, I would try to flash this one.
Greetings.

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DK Boneco said:
I used the TWRP of the X722 version to install the ROM.
Click to expand...
Click to collapse
Can you please post a link

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ziaba said:
Can you please post a link
Click to expand...
Click to collapse
Hi, this thread talks about "unlock bootloader with rom 26S" not from twrp.
Anyway there is no twrp for x722 but it works for x720.
Query in twrp threads or create one in section x722 for more information.
Greetings.

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F.J.V said:
The fault is because the bootloader is locked.
Click to expand...
Click to collapse
A friend who has the same smartphone with unlocked bootloader did the same process and the exact same error happened.
F.J.V said:
Look for another tool that does not use qfil and that allows you to flash with locked bootloader.
Click to expand...
Click to collapse
Do you know another method? All that I looked for, ending up using the background QFIL to get the job done.
---------- Post added at 12:34 AM ---------- Previous post was at 12:33 AM ----------
ziaba said:
Can you please post a link
Click to expand...
Click to collapse
Here's the link: https://twrp.me/devices/leecolepro3.html

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DK Boneco said:
A friend who has the same smartphone with unlocked bootloader did the same process and the exact same error happened.
Click to expand...
Click to collapse
The hard brick came from gapps on top of 26s. Never flash Gapps on top of stock ROMs. Never.
The 26s firmware locked bootloader blocking the CRITICAL partition, so you must unlock it first, then unlock the bootloader.
Try this sequence, in fastboot mode:
fastboot devices
fastboot device info
- when in fastboot device info, check CRITICAL partition unlock status. if FALSE, then try
fastboot flashing unlock_critical
fastboot device info
- now CRITICAL partition unlock status should be TRUE, try unlocking
fastboot oem unlock-go
- if you succeded unlocking, check status with
fastboot device info
fastboot reboot or fastboot flash recovery twrp.img
- if you still cannot unlock, you could try flashing a different emmc_appsboot.mbn file. You can extract emmc_appsboot.mbn from x722 20s firmware or from x720 firmware.
In fastboot mode
fastboot flash aboot emmc_appsboot.mbn
- if flashing is successful
fastboot reboot
adb devices
adb reboot bootloader
fastboot oem unlock-go
- if unlock is succesful
fastboot device info
fastboot reboot or fastboot flash recovery twrp.img

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Flounderist said:
The hard brick came from gapps on top of 26s. Never flash Gapps on top of stock ROMs. Never.
The 26s firmware locked bootloader blocking the CRITICAL partition, so you must unlock it first, then unlock the bootloader.
Click to expand...
Click to collapse
I tried this and several other ways to try to unlock the bootloader. I could not find a way. It does not allow flash any partition.
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DK Boneco said:
I tried this and several other ways to try to unlock the bootloader. I could not find a way. It does not allow flash any partition.
Click to expand...
Click to collapse
Would you try
fastboot format userdata
fastboot format data
fastboot reboot bootloader
fastboot device info
Check if (bootloader) is_allow_unlock: changed from 0 to 1. If it is still on 0 try
fastboot erase userdata
fastboot erase data
fastboot reboot bootloader
fastboot device info
If still on 0....try also formatting or erasing cache.
It seems that kernel does not allow any tampering attempt if value is =0, hence critical partitions are locked.

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Hello DK Boneco, the error is reading the COM port.
Is the phone charged?
It appears that the phone is disconnected or exits EDL mode.
It may be a driver problem, or some phones exit EDL mode within a few seconds if the flash has not started.
Try not to take more than 4 or 5 seconds from the time the phone enters EDL until the flash starts.
You can also try the flash with MiFlash Xiaomi, say that can flash any modern phone and is quite effective, look for a manual and test.
Greetings.

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DK Boneco said:
And Windows emits the disconnected device sound.
Click to expand...
Click to collapse
You may need to install drivers to your pc to recognize your, thats why it emits the disconnected device sound.

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Hello DK Boneco, try these steps:
1. Method published with flashone2.0 and zip qfil.
2. When the fault appears, disconnect the USB phone.
3. Reconnect the phone in EDL mode (vol + and vol- and connect to USB)
4. Without losing time, in flashone2.0 press the "Refresh" button, select the COM port, press the "Flash" button and then "NO" (do not unzip it again).
From connecting the phone to USB until you press the "NO" button as fast as possible, without wasting time.
I hope it serves as something, what I see is that the phone goes out of EDL mode and that's why it fails.
Greetings.

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To be sure to stay in EDL mode, you can type
fastboot reboot edl or fastboot reboot-edl
Be sure to install Qualcomm driver properly on PC.
Anyway it seems that QFIL is missing for X722 device. I assume that this device lacked a lot of development due to company failure, or it was developed exclusively for CN market (no google play support and locked bootloader from kernel to avoid any hacking activity).

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Qfil is a Qualcomm tool for any Qualcomm smartphone, no matter brand or development.
Qfil should work for any phone with chip qualcomm, another thing is that the phone requires some specific configuration, or that the zip that is intended to flash is not correct.
Greetings.