[Asus ZenFone 3 Zoom Guides, News, & Discussion] vincom:
FOR THE ASUS 3 ZOOM ZE553KL

I Found These Working Asus Service Technicians Full Stock Firmwares. They Include Files That Are Not In Asus' Website FW.

Includes The Last 7.11 Nougat Before Oreo Was Released

Info I Found About Tech Fw:

These Are Untouched Full Stock FW

You Can Just Flash The Normal Files Recovery.img, Boot.img And System.img To Change Android Versions Or To Unbrick

Recovery.img, Boot.img And System.img And The Emmc_appsboot_8953.mbn File (Could Be The Bootloader)were The Only Changes Throughout The Fw's, All The Other Files/partitions Are The Same Such As The Radios Etc

The Bootloader Lock Status Doesnt Get Changed Afaik

You Can Still Update Using Asus' Builtin Update

They Are In Zip Format, Unzip Them To Their Own Folder

HOWTO FLASH

PREREQUISITES:

Make A Nandroid Backup

If Bootable Remove/Signout Of Google Account

(Might Work With Locked Bootloader, IDK)

Ze553kl(Zenfone3 Zoom) Phone With Unlocked Bootloader(used unlocker apk from asus website when phone was in running state)

Unlocking Bootloader App Available From Asus - was for upto nougat 7.11

Usb Asus Drivers

Usb Debugging Enabled On Phone, Maybe Not But Wont Hurt To Try

Computer Running Windows

Usb Data Cable For Phone

ON PHONE

If Bootable Enable Usb Debugging, Uncheck Verify Apps Via Usb, Remove Google Account

Backup Internal Sdcard - Most Def As It Will Get Wiped

Make Nandroid Backup

Remove Sdcard, Just In Case

Put Phone Into Fast Boot Mode- Unplugged, Phone Powered Off - Vol Up + Power Button Pressed, Hold Both Until Screen Comes On.

Plug Usb In Cable To Phone From Pc.

METHODS:

After Unzipping Them To Their Own Folder

1. From Within The Extracted Folder Double Click "Flashall_aft.cmd" Will Auto Open Command Prompt And Start Flashing All The Files Via Its Included Fastboot, Or....

2. Manually Open Command Prompt Within The Unzipped Folder And Type "Flashall_aft.cmd", Or....

3. Use Your Local Copy Of Adb/Fastboot And Manually Flash These Files And Commands:

fastboot flash recovery recovery.img
fastboot flash boot boot.img
fastboot flash system system.img
fastboot format userdata
fastboot reboot

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IF STILL BRICKED OR ODD BEHAVIOR BUT CAN BOOT TO BOOTLOADER/FASTBOOT THEN DO THESE COMMANDS WHEN IN FASTBOOT MODE

fastboot erase system
fastboot erase recovery
fastboot erase boot
fastboot erase userdata
fastboot -w
fastboot erase splash
fastboot erase cache

THEN

RE-BOOT

BACK INTO BOOTLOADER AND CHOOSE ONE OF THE THREE METHODS

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Disclaimer Im Not Responsible For Yours Or Anyone Elses Devices, Do At Your Own Risk

DOWNLOADS

FIRMWARES I FOUND UPLOADED TO ANDROIDFILEHOST:

CHECK THE MD5 AFTER DOWNLOADING.

ZE553KL-WW_71.60.139.30_7.1.1_NOUGAT_2018/03.zip - The Last Nougat Before Release Of Oreo

Just Want To Flash The Base Files, Goto This Thread By Me

ZE553KL-WW-20.32.67.25_7.1.1_NOUGAT_2017/07.zip

ZE553KL-WW_11.40.86.71_ 6.0.1_MM_2017/04.zip - Not Tested By Me

ZE553KL-WW_10.40.47.107_6.0.1_MM_2017/02.zip - Afaik The Initial Fw Shipped W/the Phone

ADB_FASTBOOT_1.4.1.ZIP