I'd recommend flashify to flash recovery images. You can download it from the play store. So easy to make a typo and mess things up with adb and dd.
You could do it with a terminal or adb shell. Say you store the image in /sdcard
Code:
su
dd if=/sdcard/recovery.img of=/dev/block/mmcblk0p14
Verify mmcblk0p14 is recovery before you try this. I'm pretty sure that's right, but I don't have my tablet right now and you can make a serious mess of your device this way if you overwrite the wrong partition. Check it by listing your partitions with this:
Code:
su
ls -al /dev/block/platform/*/by-name
By default this little tablet does not have fastboot, but you can enable it with
this method. I've zeroed out my laf partition and verified I can boot into fastboot mode, but I've never actually used it to flash anything. It just seemed like a good idea to have fastboot available to fall back on rather than LG download mode since there was no kdz available for the V410 for a long time.