Xiaomi mi5x (oxygen) problem bootloader - Xiaomi Mi 5X Questions & Answers

Hello. The problem is as follows: when I try to unlock the bootloader on my Mi5x (oxygen), it writes to me: device basic data verification failed this device couldn't be unlocked. I tried different ways: changing firmware, changing account, formatting, downgrading firmware, upgrading firmware. Tried different USB ports, different processors, different operating systems. This error is constant. The loader is blocked (100%, checked in different ways). Help, there is no description of the error anywhere ((((
P.S .: sorry for my bad English, I use a translator)))

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Need a solution badly.."Invalid ID:Device ID must be a valid IMEI or MAC address."

Need a solution badly.."Invalid IDevice ID must be a valid IMEI or MAC address."
"Invalid ID:
Device ID must be a valid IMEI or MAC address. Without device ID, some Mi Account and Cloud features won't be available."
then it goes for checking device status
Followed by this error:
Couldn't check the Find device status.
What l had done.
A month ago my mi3 started showing "insert sim card" though there was already one in the mobile, i thought that this because of newly "weekly update" but after next update it didn't solved, so i searched for the problem on google and this forum and i found that this problem is hardware one. So i went to the expert, he checked and said that the sim tray is running fine. Then again i waited for an update and it arrived but then again it didn't solved.
Finally i applied "Wipe & Reset" and came the disaster, miui 8 started in fashion but while i was in some elementary steps of selecting language and country I was encountered with this error--
"Invalid ID:
Device ID must be a valid IMEI or MAC address. Without device ID, some Mi Account and Cloud features won't be available."
and I finally stopped at MIUI ACCOUNT Details form.
Followed by this error:
Couldn't check the Find device status.
I reset it several times but the outcome is nil.
I even tried Flashing using Mi pc suite with "miui V7.5.6.0.MXDCNDE" it does nothing and repeated again and again except changing miui 8 (6.7) developer to miui 7.5 stable.
I have no EFS saved
Current status.
phone not opening competely, no debugging option on, no root access.
Is there anyone who can help and guide me.
If you have not tried fastboot, then give it a try. And after it boots try to skip all the MI authentication steps. I think Mi framework is checking something and then giving you error.
Try flashing an old backup. I had the same issue but on pa 6.0(unofficial) or flash a cm rom and see if the problem exists.
There are modules for XPOSED that will allow you to force an IMEI or change various device ID information, you'll be good

Unlocking bootloader error code

I was trying to acquire the code for unlocking bootloader, but the page does not provide it, with the error "SN and IMEI are mismatched".
Verify the data several times and they are all correct, try in many ways, with different browsers, in different languages, with different accounts, and it turns out to be the same in all cases.
Any solution?
The problem is on the Huawei page
Double check SN in Project menu, by 'dialing'
*#*#2846579#*#*
Otherwise, if previous owner changed IMEI?!

Unbricking device, stuck on empty board repair. Can someone help?

I have a phone that I have tried to rebrand (LLD-AL10 -> LLD-L31). As a start, I used HCU client to write new Model/Vendor/Country..
(following this instruction: https://hcu-client.com/huawei-phone-country-vendor-repair/)
..but since then I haven't got it running again. Flashing the new customization files afterwards failed and phone didn't boot up since then. :crying:
Tried several repair/restore/wipe step-by-steps, now I have ended up with a totally erased device. IMEIs, serial number, model, country, vendor are all blank.
Amongst others I found this guide that actually help me quite far, but unfortunately not all the way.
https://forum.xda-developers.com/9-lite/how-to/guide-unlock-frp-phone-bootlooping-t3808650
I get stuck on step 10 since HCU does not allow me to write the parameters.
CDMA repair including MEID is what I want to do => Error box "use UMTS"
UMTS repair => unknown chipset
2018-11-02 13:10:53.827 Autodetect COM port and phone type start!
2018-11-02 13:10:54.467 Found COM port: COM7
2018-11-02 13:10:54.471 Found phone type: Huawei Android phone (HiSilicon CPU)
2018-11-02 13:10:54.594 ERROR!
Not supported/unknown chipset!
Find it weird that chipset is unknown/not supported, since it was with HCU I actually bricked the device in the first place!?
I currently use v290, according to release notes support for H9L was added in v257 but has that been removed? Unfortunately I've deleted v257 and haven't been able to find it for download.
Today's status:
- unlocked bootloader
- TWRP
- Treble v25 (stucks on bootlogo)
- ADB access
- HCU / Phoenix / Unlocker license
- Full OTA firmware including customization
- Serial# 0123456789ABCDEF
- IMEIs, Model, Vendor, Country are all blank
Will I be able to restore my device from here and how should I do it?

Unlock tool an unknown error occurs?

I'm trying to unlock my bootloader to install root in the android 10 beta, and the official bootloader unlock tool is giving me this error-- see below. Is there any way to go around the app or fix the issue, I've tried rebooting and it's been way since the early morning. Both wifi and cellular results in this error.
Maybe that not support android Q
Check if you have a serial number. I had this issue when I bought the phone from eGlobalCentral. They have a WW rom on the tencent version but they heavily screwed up the install messing up the EFS and destorying the serial number leaving me with a default one.
Because of this I think the app could not send the serial number to the ASUS server to be verified returning an "Unknown Error".
This might not be the case with you but that was certainly what happened with me.
You can try unlocking via EDL mode also
https://forum.xda-developers.com/rog-phone-2/how-to/how-to-unlock-rog2-phone-via-edl-mode-t4008267

Original imei is gone

Hi there. I have some difficult trouble with my imei. After installing an official rom with odin i got my imei1 changed to another one. Beause of that, there is "only emergency calls" displaying and mobile services aren't working.
Smart switch is useless, cuz my phone was previously used by another person i bought it from. So, Switch asks an emergency repair code from an old PC, but the previous owner doesn't have a clue about that code.
Combination rom can't be installed, ofc.
Other roms i've tried to install don't give any result. There were different official roms with different versions and CSC, a couple of customs, separate parts of roms.
Also I've done all possible wipes in different order and different ways.
Additionally, i've tried to change imei1 to my default imei using Magisk Modules, Xposed Modules and terminal emulator.
Soooo, guys, help me please, can i fix it someway?
*bump*

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