After attempting to install a recovery (CWM 6.x, I think), my F240L boots normally but if rebooted into recovery - either through ROM manager or adb - it displays the android with stomach open and warning triangle error image. Anyone else experienced this?
Note: The phone did already have a recovery installed (older CWM) and I had successfully used that to flash a ROM or two.
I have exactly the same situation you describe.
I solved this by installing the recovery using "vu2 jb 2nd-init recovery" for Optimus G Pro (just google it). Once installed, I was able to reboot into recovery with no issue
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