LG V10 H900 (AT&T) Fastboot No Devices - LG V10 Q&A, Help & Troubleshooting

Hello, I have an LG V10 H900 (AT&T) but it is not being detected in fastboot. Only ADB commands work.
When I do "adb reboot bootloader", it restarts the phone and then when I try and run any fastboot command then it only displays the message "waiting for device". I have installed the correct LG Drivers for my device. I'm running windows 10 and In my device manager all the drivers are installed. Please help me with my Fastboot not being detected.
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My Device shows when I do "adb devices" but it doenst show when I run fastboot commands.

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error image :
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I'm not able to boot in twrp recovery in my redmi note 4 please help!

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Because TWRP successfully installed, you start it from Windows commandline as shown next
Code:
adb devices
adb reboot recovery
adb wait-for-device
jwoegerbauer said:
Because TWRP successfully installed, you start it from Windows commandline as shown next
Code:
adb devices
adb reboot recovery
adb wait-for-device
Click to expand...
Click to collapse
thankyou

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