TWRP flashing trouble

Also it will not show up in the LG up app this is what I get when I try to flash an recovery "target reported. Max download size of 536870912 bytes
Sending 'recovery' (31748kb)...
Okay [0.710s]
Writing 'recovery'...
FAILED (remote: unknown command)
finished. Total time .728s"
I have to be in ptp mode just to get adb to recognize my phone any suggestion. My boot loader is unlocked

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