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BootLoader Unlock (both ZE551ML and ZE550ML)

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By ravian29, XDA Ad-Free Account currently disabled on 19th June 2015, 06:59 AM
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Congrats to all ( both ZE551ML and ZE550ML users), bootloader has been unlocked without connecting to ASUS servers.

2.19.40.20 is also unlockable
New update 2.19.40.20 can be unlocked as well and Asus did not patch the hole. Thanks to @oxydius7 for confirming this here

Bootloader of both ZE550ML and ZE550ML can be unlock if rom is on 2.19.40 or 2.19.40.20

Lets discuss, problems and unlocking related experience here.

How to unlock bootloader:

1. Update to 2.19.40.18 or 2.19.40.20
2. root it
3. make sure adb is insatlled and working
4. enter the following commands in cmd

adb shell (press enter)
su (press enter)
getprop ro.isn > /factory/asuskey ( press enter)
reboot bootloader ( press enter )

Phone will restart in bootloader and after updating itself phone will restart again and ASUS splash screen will be white ( locked bootloader has black screen, you will see difference by yourself)

5. download black splash screen for 551 from here

https://mega.co.nz/#!IlMGiZ7I!kepXRF...4UufAJT6YEDU3k

or for 550 from here
http://forum.xda-developers.com/atta...6&d=1435127302

6. navigate to adb folder open cmd and type the following commands

adb reboot bootloader (press enter)
fastboot devices (press enter)

see if device is listed, write following

fastboot flash splashscreen splashscreen.img (press enter)

restart your phone and now black splash screen is back. Congrats your bootloader is now unlocked.
If you follow my steps there would not be any data loss from internal memory and sd card, but i will advice to take a backup in case if you are out of luck

ZE551ML OTA 2.19.40 OTA Download:

http://fota.asus.com/delta_package/p...2_20150612.zip
you guys can side-load or flash in via recovery method
Thanks to @fuzzybuffalo for providing the link

Download ZE550ML 2.19.40.12 complete Rom:

Download Here
Changelogs
credit goes to @keepfishes for coming up with links on post

Download ZE550ML 2.19.40.12 OTA Rom:
Download Here
credit goes to @singhnsk for coming up with links on post

Tip:

if you have problems with adb try to install "Terminal Emulator" app and running the commands from there

su
getprop ro.isn > /factory/asuskey
reboot bootloader
Thanks to @hugoprh for providing the tip, thank to him on his post

white splash screen for 551
Download
credit goes to @fuzzybuffalo for providing the link, thank to him on his post

Twrp Flashable, Black and white splash screens for 551
If you want twrp flashable zips of both white and black splash screens of 551, please download them from here


I will not take any responsibility, its your device and your will to try this
All credits goes to @shakalaca for providing unlock
donate and say thanks to him, press thanks button if i helped
Last edited by ravian29; 2nd July 2015 at 02:32 AM.
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19th June 2015, 08:01 AM |#2  
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anyone tested this method already? is it safe and does the unlock method cause data / os wipe?
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19th June 2015, 08:05 AM |#3  
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Nice. This is great new. Thanks to @shakalaca. Cant wait for @TheSSJ to get TWRP working.
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19th June 2015, 08:07 AM |#4  
Quote:
Originally Posted by cangcan

anyone tested this method already? is it safe and does the unlock method cause data / os wipe?

i tried it and no it will not wipe any data if you follow my steps
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19th June 2015, 08:08 AM |#5  
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Quote:
Originally Posted by cangcan

anyone tested this method already? is it safe and does the unlock method cause data / os wipe?

Can confirm it worked flawlessly, took literally 15 sec to do.
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19th June 2015, 09:18 AM |#6  
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Thumbs up
Wow, cant wait for the development to begin... Cyanogenmod+4gb Ram+ 64gbStorage ...
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19th June 2015, 10:35 AM |#7  
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Quote:
Originally Posted by ravian29


5. download black splash screen from here

https://mega.co.nz/#!IlMGiZ7I!kepXRF...4UufAJT6YEDU3k

Would it be possible to create a mirror for this file. maybe google drive? My ISP is blocking Mega. Thank you
19th June 2015, 11:46 AM |#8  
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Quote:
Originally Posted by saurabhrck

Would it be possible to create a mirror for this file. maybe google drive? My ISP is blocking Mega. Thank you

Here ya go, https://drive.google.com/file/d/0Bzk...ew?usp=sharing
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19th June 2015, 12:28 PM |#9  
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Great news. Looking forward to start Breaking this baby.
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19th June 2015, 02:30 PM |#10  
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Is it possible to do this on 2.18? My phone just refuses to update to 2.19 no matter what I try.
19th June 2015, 02:36 PM |#11  
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Quote:
Originally Posted by Christopher876

Is it possible to do this on 2.18? My phone just refuses to update to 2.19 no matter what I try.

I dont belive so, the needed files are part of the 2.19 update. I also had a problem with the update so I had to reset phone, then sideload a full copy of 2.18 and then sideload the 2.19 update and reroot phone.
Last edited by Triston182; 19th June 2015 at 02:40 PM.
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