Someone please help me!! Recovery Flash

i have tried evrythin possible i can... i keep getting some command


C:\Program Files (x86)\Minimal ADB and Fastboot>fastboot devices
94975f80 fastboot

C:\Program Files (x86)\Minimal ADB and Fastboot>fastboot flash recovery recovery
.img
target reported max download size of 536870912 bytes
sending 'recovery' (31748 KB)...
OKAY [ 0.935s]
writing 'recovery'...
FAILED (remote: unknown command)
finished. total time: 0.954s

C:\Program Files (x86)\Minimal ADB and Fastboot>