Flash the recovery .img like you'd flash a kernel. "fastboot flash boot recovery.img". The device will automatically boot from the image flashed to the boot partition. Usually this is the kernel, but in your case hopefully it will boot into recovery...
Sent from my HTC One X+ using Tapatalk 2
Looks like it is corrupted.I get this when i flash it but it doesn't reboot into recovery still, just a blank screen.it shows this once flashed
c:\android>fastboot flash boot recovery.img
sending ' boot'... <5254 KB>...
OKAY [ 0.688s]
(bootloader) format partition LNX done
OKAY [ 0.328s]
finished. total time: 1.016s