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when do i need an unlocked bootloader & flashing methodes

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i'm little bit confused about unlocking the bootloader on an mi5 device. I read somewhere that it's not needed if you use the updater app on the phone. i think this is only true for official rom's which came from en.miui.com it self?
can i use the updater app if i want to install the official en.miui.com 8 global rom without unlocking the bootloader?
if i want to install an xiaomi.eu rom, i will have to unlock the bootloader first?
does root on an official rom need an unlocked bootloader too?
there are more then one way to flash an rom on an mi5 device, updater app, fastboot and miflash tool, twrp(which is not preinstalled i mean?). but i read something about an edl mode, but cant find out what this does mean? is this maybe the fastboot and miflash tool mode?
many thanks!
best regards
adnan

Hello there,
what ROM are you running currently? Broadly speaking, you have 2 tools to change the ROM on Your device: the updater app and Fastboot (miflash uses fastboot too, and twrp requires fastboot to be installed). The updater app allows you only to upgrade your current ROM to the newest version. Fastboot (and the related tools) allow you to change ROM completely (e.g. switching from China Stable to China Dev or from China Stable to Global Stable or from China Stable to miui.eu Stable), and will also allow you to root your device through TWRP. To use fastboot, however, you will need to unlock Your bootloader.
Regarding EDL mode, it is the Miui stock recovery mode, which can be used together with the Xiaomi desktop application to flash new ROMs. It is not a widely used method, because the desktop app is quite buggy.

hello
many thanks for your replay.. i'm currently on miui 8, the global alpha version, so i already do an flash.. your answer is toop, again thanks for that!! but there are some new questions, edl is the miui stock recovery mode, does this mean the recovery as i know it already in a form from recovery.img? if i also want root i will have to flash twrp, this would then mean that the miui stock recovery (edl) wouldn't work anymore? so if i want to go back to an official global rom, do i need to flash the stock miui recovery first? the way to do that would be through fastboot? where can i get the stock miui recovery?
have an nice day!

miui 9.1.1 global

what i need? for flash a lineage os? and ols recommend me custom rom

http://en.miui.com/thread-299790-1-1.html
1.Unlock Bootloader
2.Flash latest MIUI Global Stable via fastboot
3.Install latest TWRP via fastboot
4.flash current latest firmware https://drive.google.com/file/d/120anSMHTx7wfqg5QRg3LGkMtQkH73Vv3/view?usp=drivesdk
5.Download the rom you want go to TWRP wipe everything
6.Flash ROM, (and gapps and magisk if needed)
7.DONE

if i do not flash firmware what will?

ngato35 said:
if i do not flash firmware what will?
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I'ts not so hard is it ? You will have some problems with custom roms, cause they don't include one like MIUI roms.

Question How to install miui 12.5 beta 21.9.30?

Any method install??

ZJaY124 said:
Any method install??
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Click to collapse
Yes there is a method. First you need to clean flash china rom first then use MIUI updater to flash MIUI 12.5 but for me its not working because my device goes into a bootloop after installing china rom. Maybe you should try flash china rom and see if it's work for you or not.

william liu said:
Yes there is a method. First you need to clean flash china rom first then use MIUI updater to flash MIUI 12.5 but for me its not working because my device goes into a bootloop after installing china rom. Maybe you should try flash china rom and see if it's work for you or not.
Click to expand...
Click to collapse
i try install china rom first time i got dm-verify corruption i dont know how to fix

ZJaY124 said:
i try install china rom first time i got dm-verify corruption i dont know how to fix
Click to expand...
Click to collapse
Just Press Power key it should boot.

[QUESTION] ARB version is same in both my phone and the rom i want to flash. Is it safe??

I have my merlin device running on miui 12.5.5 and I want to downgrade it to miui 11. I have checked ARB versions of miui 11 rom and it is 2 and same is in my phone.
Is it safe to flash miui11 rom with miflash tool?

Manjotbenipal said:
I have my merlin device running on miui 12.5.5 and I want to downgrade it to miui 11. I have checked ARB versions of miui 11 rom and it is 2 and same is in my phone.
Is it safe to flash miui11 rom with miflash tool?
Click to expand...
Click to collapse
Yes, you can flash minimal versions down.

Do i need to wipe my all data before flashing and if so I dont have recovery so how can I do it?

Manjotbenipal said:
Do i need to wipe my all data before flashing and if so I dont have recovery so how can I do it?
Click to expand...
Click to collapse
You earlier mentioned Flash tool, well, you should flash it using SPFT. Take care to use the option Format data, I would advise to not use it at all, you have to only flash it, in the case you want to preserve data, then don't flash this partition, leave it blank.

Question Switching Rom

To switch from indian rom to any other official rom,what should i do?If anyone switched,How did you do that?What should i keep in mind?

Hey there,
I switched from EEA 12.5 to Global 13.0
Unlocking BL,
Installing twrp,
Booting to twrp,
DL your desired rom,
Flash it,
Finally Reboot
Beware of ARB