Problem flashing Kernel for 6633

Somewhat new to this, but I successfully rooted my 6633 which has stock 4.4.4 (Which I re-installed the stock firmware fresh). Afterward I Installed TWRP and attempted to create a custom recovery (I could never boot into recovery and tried many times and many ways), and assume I must at least create a custom recovery. Anyway, in attempting to create the recovery I tried to flash the img file. However, I could not find an image for the 6633 and (stupidly) flashed the image for the z3c. But other than freezing the phone the first time I shut it down, everything on the phone works fine. But a recovery was never created. I then found an img for the 6633 and tried to flash it but simply got an error message saying that "Failed remote: image is not a boot image". Apparently either the original mistakenly loaded (z3c) image won't let me flash another over it (unlikely, since it may have never even loaded) or (more likely) the new correct image is bad or corrupted. It is called "bootZ3dualmonxtest01.img" and was downloaded from another site. Searching this site I did find a kernel for the Z3 6653 but there is not any kernel for the 6633.

Again the phone works fine and I can do some file management things in the root, but the whole reason for doing this rooting process is so I can flash a mod to fix the crappy ringtone volume, that I located in another thread on this forum. It's been a journey & I had a lot of fun learning, but I'm not even sure that, in the end, the mod will even fix the ringtone volume (although posters on that thread claim it works). But that's a whole other issue. (lol). Sorry for the wordiness. I read the forums a lot and tried to be thorough. I know there are a lot of really smart people helping newbies like me. Any help is appreciated.