Need help to unbrick Xiaomi MI9

[Magellan]

Hello,

I flashed the latest version of the official xiaomi EEA rom on my Xiaomi MI9 and made the mistake of re-locking the bootloader with the "fastboot oem lock" command because I wanted a phone in an official state. Since then, my phone boots until the MUI logo is displayed and then reboots. The official xiaomi unlock software ask me to change some parameters in the settings but I can't access to anything since it can't start. I found a way to enter EDL mode with the famous "Test points" but Xiaomi's software flashtool refuses to flash a new ROM because my account is not authorized to flash in this mode. So I am desperately looking for the patched prog_ufs_firehose_sdm855.elf file for my mi 9 cepheus or any other solution to get me out of this.

I found someone on this forum who managed to do it with the UFI dongle. I've seen a video showing this dongle on youtube and it seems that it is a device where we can put a SIM card. Is this really required to flash a new ROM ?

So, if anyone has a solution for me, I would really appreciate.

Thanks for your help, David.

 

[18473446533]

use ufi 1.6.222 flash firmware

 

[Magellan]

use ufi 1.6.222 flash firmware

Many thanks for the reply. I didn't know this software and when I search in Google, it seems there is a hardware box with it ? Do I have to buy this hardware ? If yes where ?

 

[18473446533]

非常感谢您的回复。我不知道这个软件，当我在谷歌搜索时，似乎有一个硬件盒？我必须购买这个硬件吗？如果是的话在哪里？

I am Chinese, you can send me a private message on QQ, 3036869674, and remotely authorize you to repair, which only costs 80 RMB.

 

[Magellan]

I am Chinese, you can send me a private message on QQ, 3036869674, and remotely authorize you to repair, which only costs 80 RMB.

Many thanks for your help but I will never do such a thing because of security reasons. Nobody will take control of my computer.

 

[Magellan]

use ufi 1.6.222 flash firmware

Ok, I've found the software but it refuses to install until it detect UFI box or dongle. Is one of these hardware required and if yes, where can I find it ? Thanks for your answer, dear saver.

 

[Magellan]

Is there anyone who can help me without wanting to make money off me? No one to tell me what to buy, how much it costs and where to get it to fix my phone? I'm not rich or I wouldn't be wasting my time trying to fix a 3 year old phone. If it's not worth it, I'll have to give up.