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Try to upgrade firmware but not detected

Star II
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.

Community Legend II
Hi dr.nasseer
Thank you for your asking. To perform a cross-Android update, you need to update to the previous Android 7 version before the first Android 8 version. Kindly refer to the steps below
Auto update>WW-14.0400.1808.206>Manual update>WW-15.0400.1809.405>Auto update>Your preferred version
#ZD553KL Firmware Spot
#Manual Update Guide

Star II
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

Community Legend II
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

Star II
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?