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ZenFone 2 ZE551ML/ZE550ML downgrade guide from Android 6.0 Beta

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nikkojamesreducto PHL Moderator | All posts
Last edited by nikkojamesreducto on 2016/6/21 10:21

Basic information:
* Latest version of ifwi for Android 5.0 locked bootloader is 94.177
* Latest version of ifwi for Android 5.0 unlocked bootloader is 94.173
* Latest version of ifwi for Android 6.0 locked bootloader is 94.183

What we know so far:
* DO NOT flash droidboot.img in Android 6.0 update when ifwi version is 94.17x
* The bootloader will be ' locked ' after flashing Android 6.0 update.
* The splashscreen of Android 5.0 and Android 6.0 are in different format and if you don't update after changing the ifwi version, your phone might not boot.

How to downgrade (to Android 5.0 bootloader)
1. Grab ifwi and dnx of Android 5.0
https://mega.nz/#F!wldiGSCR!BARZoUr3UsaAl1Eg1AmvZg

2. Grab latest version of DroidBoot for Android 5.0 (2.20.40.184 for 551ML or 2.20.40.149 for 550ML)
https://mega.nz/#F!k4MHiAgL!dVuOKeH3eokcwPSNI79ffw
https://mega.nz/#F!wp9HyJzK!iS9JaeHRTldfjobpu8RMdg
https://www.asuswebstorage.com/n ... BB92141D82849A45A5Y
https://www.asuswebstorage.com/n ... ED8CD381BC9AC875AAY
https://drive.google.com/folderv ... V0ZaQnB4RnZiWXNWNjA
https://drive.google.com/folderv ... j55ha0Qwd3ppdXNEZXc

3. Grab splashscreen.img
https://mega.nz/#F!l1FAES7R!yZCeD_wl-L0NrrAWbEv2_A

4. Grab stock ROM from official download site or whatever system.img of Android 5.0 from the link above (2)

5. Flash the files by following commands through fastboot (ZE551ML for example):
fastboot flash dnx dnx_fwr_ann_a0-mofd_v1-ze551ml.bin
fastboot flash ifwi ifwi_ann_a0-mofd_v1-ze551ml.bin
fastboot flash fastboot droidboot.img
fastboot flash splashscreen splashscreen_ze551ml.img

6. Reboot to booloader again and do whatever you want:
   a. flash stock recovery and sideload stock rom
   b. flash boot.img / recovery.img / system.img

Originally shared by shakalaca

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PHL Level 1 | All posts
Thanks for the guide. But for the newbies, please make a detailed tutorial and  video on how to downgrade ze551ml Marsmallow Beta to Lollipop
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IDN Level 3 | All posts
I will never downgrade this, because in my review this rom run smoothly, fast and my phone no overheating problem with this beta rom, and untill now I can't find any bug yet, my ZE551ML 2/16 became more stable  better than lolipop
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RUS Beta Tester | All posts
I will not downgrade though my phone hangs frequently, so far I have not found a solution and I will be waiting  for a fix
Props
What we know so far:
* DO NOT flash droidboot.img in Android 6.0 update when ifwi version is 94.17x
* The bootloader will be ' locked ' after flashing Android 6.0 update.
* The splashscreen of Android 5.0 and Android 6.0 are in different format and if you don't update after changing the ifwi version, your phone might not boot.


I think I've did this mistake, I've tried to flash droidboot.img from .139 firmware to unlock bootloader after flashing MM Beta. Now my phone is not booting (Gives a black screen, there is no display at all...) Can you please help me to recover it back...
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IDN Level 3 | All posts
s-harlamov posted on 2016/6/19 18:15
I will not downgrade though my phone hangs frequently, so far I have not found a solution and I will ...

Are you didn't Factory Reset your phone, I have no problem with that
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IND Level 2 | All posts
where we have to write the commands mentioned above..please provide screenshot
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HUN Level 1 | All posts
Ponnuvel Pandian S posted on 2016/6/19 17:26
I think I've did this mistake, I've tried to flash droidboot.img from .139 firmware to unlock boot ...

I did the same mistake.

http://forum.xda-developers.com/ ... -zenfone-2-t3284256

this one solves.
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LTU Level 2 | All posts
My ifwi version was 94.183, I did everything correctly what it says in the tutorial, flashed the splashscreen too and after shutting down my phone just died, no signs of life. Now I have to bring it to ASUS support center and hope that the warranty still applies.
Props
BRA Level 1 | All posts
Hello, in the adb i get this error "FAILED (remote: flash_image is not implemented)", what can i do?
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