As long as you have an unscrambled firmware available, you can always crossflash back. The first rule before attempting to do a crossflash is to backup your original firmware using the Flash Utility (http://club.myce.com/f44/flash-utility-plds-liteon-based-optical-drives-v6-0-1-new-190420/) and back up your EEPROM too using the EEPROM Utility (http://club.myce.com/f44/eeprom-utility-plds-liteon-sony-cd-dvd-writers-v6-2-0-new-112103/) and keep those two files safe.
When you do a crossflash, the result is that the newly flashed firmware no longer matches the original ID of the drive which is stored in the EEPROM area of the drive. In your case the drive's EEPROM says that the drive is an iHAS122 B while the new firmware loaded is for an iHAS124 B drive. The drive detects this contradiction and refuses to work, and what you get is the LED blinking all the time and the drive refusing to read or write any media. For a crossflash to be successful, the drive ID stored in the EEPROM needs to be modified to match the drive ID of the new iHAS124 B firmware. This can be easily achieved by using the "Convert Drive" option in the EEPROM Utility.
That's the whole point about making sure you know what you're doing before you do it, and the main reason for always backing up your existing firmware before crossflashing. Here's an unscrambled copy of the ZL08 iHAS124 B firmware which you can use to go back if you want:
After that you can update the drive to the latest firmware using the official LiteON flasher.
Yes, you can dump the firmware from another iHAS122 B drive using C0deking's Flash Utility. Yes, the *.bin firmware dumps are unscrambled and they can be used for crossflashing. Yes, once you have a firmware dump from another drive you can flash it back to your drive using the Flash Utility.
PS. While firmwares of identical drives are interchangeable, their EEPROM backups are not. NEVER EVER flash a LiteON drive with the EEPROM coming from another drive! Each drive's EEPROM contains unique calibration data for that specific drive. Firmware files are 2MB in size while EEPROM files are only 8KB in size.
PSS. If you want to crossflash your drive to a 24x model I suggest you crossflashing it to an iHAS524 B model. That would give you the maximum number of extra features possible.