Originally Posted by EarlyMon
Have you verified that the winrar is simply packaging - and not compressing - the recovery.img file inside?
Sorry, I'm not conversant with winrar (it's been at least a year or more since I was last near it) but that's a key point to making this work right.
I was using the wrong file. I figured that out after I flashed the twrp recovery instead. I got it now, but I thank you very much for your help!