Unable to unlock ZS570KL bootloader on two phones, non-pro 2.15GHz

Please tell us some basic information before asking for help:
- Model Name: Zenfone 3 Deluxe non-pro (ZS570KL) 2.15GHz
- Firmware Version: WW_Phone-15.0210.1810.73-0 (both phones)
- Rooted or not: not rooted
- Frequency of Occurrence: Every time
- APP Name & APP Version (If your issue relates to the app): "Unlock Device Tool" 9.1.0.3_180621
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
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Both phones have been factory reset and the unlock app says "An unknown error occurs, which may be a network connection issue. please wait and try again later"
Serial numbers:
************
These phones have never been unlocked.
I would appreciate help in getting both of these unlocked.
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Hi [email protected]
I have forwarded the information to the relevant department. We will keep you updated and your consideration will be very much appreciated. Meanwhile, I had edited your passage and deleted the SN. Please be aware that sharing the personal information like SN or IMEI on the Internet is quite dangerous.
Thank you. Do I wait for a message?
I will reply the thread once I receive any relative information. :)
Hi friends
The latest unlock tool of ZS570KL is now available on our official website! Please check the link below
https://www.asus.com/us/Phone/ZenFone-3-Deluxe-ZS570KL/HelpDesk_Download/
The "Driver and Tools" download section doesn't return anything anymore.
It looks like the download section isn't working with Chrome, but works with Firefox.
The new unlock tool worked. Thank you!