This is my device description: Model Name: ASUS X00LD Firmware Version: WW. 14.0400.1708.160-20170911 Rooted or not: no I tried to upgrade firmware using version WW-15.0400.1910.528 as provided on the web. I was downloaded it then copied to internal phone, but there is no reaction on system update detection such as icon notification on the drawer, even I restarted several times. What should I have to do? I want to upgrade Bluetooth version instead. And also to follow the android development until the latest firmware. Need solution... Please help me. Thanks

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Thank you for your guideline. Now my ZD553KL was upgraded to the latest firmware with Android 8.1. But the next issues are: 1. The printing option is gone, I can't print any files directly to printer using USB cable. 2. Also it can't detect any flashdisk attached with OTG. Would you please give me a solution. Thanks

Hi dr.nasseer Thank you for your reply. Can you received the notification while link on the USB? Try to tap the notification>tap "file transfer" Besides, can you tell me where can you find the printing option? I found some apk from the website for the latest firmware version, please try the apks like AsusLauncherDev, MobileManager... except "UnlockTool". ZenFone 4 Selfie (ZD553KL) Driver & Tools | Phone | ASUS Global

Thank you for your quick respons. 1. I can't receive that notification while connected via USB. Before upgraded, the USB flashdisk always detected. 2. When my firmware still Android 7.1, there is a printing option on the setting. But it's gone after upgraded. Then also can't detect USB Host Mode. Would you have any suggestions?

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Hi Carl Vincent Thank you for your asking. Could you provide me your current firmware version? Settings>System>About Phone>Software information

For cross-Android version update, you need to auto-update to the previous Android 7 firmware before the first Andorid 8 firmware, then manual update to the first Andorid 8 firmware, then auto-update to your preferred Andorid 8 firmware. Kindly refer to the steps below as ZC553KL Android 7 to Android 8 guide: (Auto-Update)>WW-14.0200.1806.355>(Manual Update)>WW-15.0200.1808.418>(Auto-Update)>your preferred Andorid 8 firmware

Manual Update Guide

[Zenfone] How to update firmware on my phone? | Official Support | ASUS GlobalPlease note that once the update is completed, all data, apps, settings and personal information will be deleted. Kindly backup your data first.

Hi all! I have problem with my old Asus Zenfone 3 Zoom. I have tried to unlock boot loader but without any luck. I have tried the newest tool, older tool - nothing helps, I get the same error - network erer, please trie in a couple of minutes. I was on newest oreo rom - didn't work, I have downgraded to nougat 7.1.1 - still nothing.

Has anyone found soulution to that?

@christine-asus