I can't flash recovery with Fastboot

Before going any further, i reverted back to stock yesterday via LGUP to fix some issues i had with the phone on custom roms that caused system crashes. Bootloader is unlocked, i get the prompt that bootloader is unlocked and it isn’t safe when the device is booting and OEM unlock is enabled in developer settings.

I’m trying to re-flash TWRP since reverting to stock via. LGUP reverts recovery back to stock. I have issues sending commands via. Fastboot which is making me unable to flash the…

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Source: XDA