ZE520KL Cannot Enter EDL Mode!!

Model: ZE520KL
RAM: 3GB
Firmware/App Version: OPR1.170623.026.WW_Phone-15.0410.1802.44-0
Location:
Frequency of Occurrence:
Rooted: No
App Name:
Description: The phone cannot recognize the EDL Mode

After i update the firmware, the phone cannot enter in to Qualcomm EDL Mode.

adb reboot edl --> the phone just restart in normal way
fastboot reboot-edl --> the phone restart in normal way
Vol- + Vol+ --> Fastboot mode
Vol- + Vol+ + Power -->Fastboot mode

Is it disabled by ASUS? Is there any other way to enter EDL Mode?
Thanks .
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