TUTORIAL: Unlock your bootloader (WARNING: This will void your warranty!) - Amazfit

Dear all
Huami has started locking their bootloaders (see the other thread) and, so far, has not offered any official way of unlocking the bootloaders to allow custom ROM flashing.
Due to the great work of our distinguished XDA developer Olivier (@kasakdor) :good: we have reverse engineered the unlock mechanism of the bootloader and can now offer to send you unlock codes for opening your bootloader again and flashing other software.
Please read and understand the following terms and conditions:
You unlock your bootloader on your own risk. Nobody else takes any responsibility on your actions and any possible consequences.
We are therefore NOT responsible for any bricked devices, invalid warranty claims, heart attacks or world wars.
Huami / Xiaomi will consider your warranty void. Do not contact Huami / Xiaomi or your dealer if anything goes wrong after you have unlocked your watch. Only YOU are responsible for the outcome of any modification you do.
This service is for personal usage only. Any identified commercial activities will be blocked.
A maximum of three unlock codes can be requested by each individual.
This service is provided free of charge. You accept that you cannot claim any charges towards us, if you are unhappy with the service or if the service does not work for you.
If ever Huami offers an official unlock service, we will stop our service. The goal is not to be in competition with Huami here, but only to provide something as long as they are not able to.
INSTRUCTIONS
You need to have fastboot installed and working correctly on your PC. You need to enter fastboot mode and get some information from your watch. Then go to the website https://unlockamazfit.com and enter your information. We will check your data and send you the unlock code. This can take 1-2 days typically.
We need to do the manual checking as we do NOT want to support any abuse (e.g. pirate companies reflashing watches).
If you have questions or feedback, please feel free to post here. Please also report briefly back, if the unlocking was successful.
Enjoy custom ROMs!

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Before continue, please read the following:​
[*] The approval process is manual, and it might take more than stated, have patience. If no unlock received within a week, contact by PM.
[*] Please keep track of the email used for the request, check in your trash and in your spam folder!
[*] DO NOT HAMMER THE SERVICE - if a request is made more than 3 times, it goes into a more detailed inspection and it takes more time for you to approve. No need in requesting 7 times.
[*] In case of an error during the filling of the form, stop and contact by PM - more retries will lock your SN/email.
[*] Once you've UNLOCKED YOUR SERIAL NUMBER - there is no need in unlocking it again after an update. if the watch gets locked, use the same unlock key.
[*] If additional help needed, do not hesitate in contacting in ENGLISH with all relevant information only: name, SN, email used.
[*] 2nd hand watches - unlock will be provided according to the original owner of the unit, make sure to have the details of the person you bought the watch from.
A detailed How to - please read before attempting, and then perform the steps.​This process is not intended for the week of heart, so embrace yourself, winter is coming, and its going to unlock your bootloader! (excited kitten noises)
prerequisites:
1. ADB/fastboot knowledge, we're assuming that you do know how to enter your watch into fastboot, and how to obtain all the relevant information needed for a successful unlock.
2. Installed and functional Google ADB drivers - can be obtained from here - https://forum.xda-developers.com/showthread.php?t=2588979 , do not forget to install them as Administrator.
3. Additional microUSB cable - as seen, sometimes the original cable provided by Huami is not co-operative, so prepare another one.
4. Make sure that your watch has at least 60% of juice.
use this tool - https://toolaio.tk/
is has instant unlock built in.​
Now ... for the fun part.
1. Reboot your watch into fastboot mode by
Code:
adb shell reboot bootloader
Make sure that you can see your watch in the Device Manager and it has its drivers installed!
2. while your watch is in the fastboot mode, type
Code:
fastboot getvar all
this will provide you with the following information
Code:
c:\adb>fastboot getvar all
< waiting for device >
(bootloader) version-bootloader: [B][COLOR="red"]U-Boot 2013.07-00096-gf3b140c[/COLOR][/B]
(bootloader) version-baseband: N/A
(bootloader) version-hardware: V1.1 20130322
(bootloader) version-cdma: N/A
(bootloader) variant: watch
(bootloader) serialno: [B][COLOR="Red"]0123456789abcdef[/COLOR][/B]
(bootloader) product: watch
(bootloader) secure: no
(bootloader) unlocked: no
(bootloader) uart-on: NO
(bootloader) partition-size:bootloader: 0x0000
(bootloader) partition-type:bootloader: emmc
(bootloader) partition-size:recovery: 0x1000
(bootloader) partition-type:recovery: emmc
(bootloader) partition-size:boot: 0x2000
(bootloader) partition-type:boot: emmc
(bootloader) partition-size:system: 0x3000
(bootloader) partition-type:system: ext4
(bootloader) partition-size:cache: 0x4000
(bootloader) partition-type:cache: ext4
(bootloader) partition-size:userdata: 0x5000
(bootloader) partition-type:userdata: ext4
(bootloader) max-download-size: 0x4000000
all:
finished. total time: 0.280s
Besides the marked in bold, you will need the watch OS version, can be obtained from the settings in the watch -> tick the cog and go to the about section.
It is advised to double check the serial number provided by the fastboot with the one imprinted on the back of the watch, to make sure that its the correct one.
US/Global watches - 1612/1619/1811- the serial must be provided in a continuous format: 12345123456789
CN watches - 1602/1609/1801 - the serial must be provided in a divided with a / format: 12345/12345678

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Very good!
I'll try tonight!

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C:\adb>fastboot getvar all
< waiting for device >
Nothing more, any idead how to solve problem ?

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Gruchi said:
C:\adb>fastboot getvar all
< waiting for device >
Nothing more, any idead how to solve problem ?
Click to expand...
Click to collapse
your watch needs to be in fastboot.
please read the description again.
Code:
adb shell reboot bootloader
Click to expand...
Click to collapse

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it is in fastboot mode
C:\Users\Gruchi\Desktop>cd adb
C:\Users\Gruchi\Desktop\adb>adb shell reboot bootloader
* daemon not running. starting it now at tcp:5037 *
* daemon started successfully *
C:\Users\Gruchi\Desktop\adb>fastboot getvar all
< waiting for any device >

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please post a screenshot of your device manager.

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Try to use different cable, sometimes it should be problem.
Or other ADB drivers version...
Gruchi said:
it is in fastboot mode
C:\Users\Gruchi\Desktop>cd adb
C:\Users\Gruchi\Desktop\adb>adb shell reboot bootloader
* daemon not running. starting it now at tcp:5037 *
* daemon started successfully *
C:\Users\Gruchi\Desktop\adb>fastboot getvar all
< waiting for any device >
Click to expand...
Click to collapse

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I got the code but I unlocked the smartwatch ... ... I tried several times but after entering the string by unlocking it tells me failed

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Worked perfect!

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MarcolinoV112 said:
I got the code but I unlocked the smartwatch ... ... I tried several times but after entering the string by unlocking it tells me failed
Click to expand...
Click to collapse
Send me a PM with a screenshot of fastboot and the command that failed.

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Also for me error:
FAILED (remote: ED)
finished. total time: 0.078s

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Worked just like the tutorial says. Many thanks !!!!
OS ver: 1.3.3a
US version
fastboot getvar unlocked
unlocked: yes
finished. total time: 0.033s

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im geting always invalid serial number... and is the same on watch..

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superino said:
Also for me error:
FAILED (remote: ED)
finished. total time: 0.078s
Click to expand...
Click to collapse
Hmm, I see that you and MarcolinoV112 both have OS 1.2.29i. Maybe Huami changed the mechanism already in that OS version.

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jardaz said:
im geting always invalid serial number... and is the same on watch..
Click to expand...
Click to collapse
My bad i forget the / waiting for the email

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Bootloader unlocked successfully! Many thanks!
(1.3.3a US)

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Work many thanks 1.3.3a

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FAILED (remote: ED)
finished. total time: 0.068s
With 1.3.3a :'(

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Waiting for the unlock code in my email.