Many posts and guides ask to use command as below to flash recovery image to phone as:
cat /sdcard/flash_image > /system/bin/flash_image
chmod 755 /system/bin/flash_image
flash_image recovery /sdcard/recovery.img
Where can one find this flash_image binary file?
At the risk of being redundant and repetitive I am posting link for flash_image binary file. If one is using ADB Tool or Terminal to flash recovery image or kernel image or boot logo image to phone then one needs flash_image binary file. Here is the link for zip file:
[GUIDE] Flash any recovery easily on the phone using flash_image - xda-developers
Download and save the zip file at the end of the above post. Extract flash_image zip file from the zip file (Use WinZip or 7Zip Tool). Copy flash_image binary file to your phone SD card.
Or one can Google - flash_image binary to find it on the web.
If you want simple method to flash recovery image or kernel image or boot logo image to your phone the use FlashImageGUI App from the following link:
[APP] Flash Image GUI