You can also do it in terminal emulator.
Make sure you have flash_image binary in /system/bin. If not, google it and drop it there. Rename recovery to recovery.img and place in root of sd.
In TE type:
flash_image recovery /sdcard/recovery.img
And that's it!
Edit: if that doesn't work, move the recovery image to /system/bin and, in TE, type:
./flash_image recovery recovery.img
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