Well for anyone that has the IP8M-2496 cameras (the ones that are always on Amazon deals), I went ahead and tried this and can confirm that BINGO......IT WORKS ! Now have IVS on these cams. I will let you know that I did have to upgrade the Amcrest to the latest first then go ahead and upgrade to the Dahua. Also it does keep your old password so don't worry that you are not prompted to setup new. The old firmware upgrade screen looked different but the new one looked very similar to the Dahua upgrade screens we are used to so knew it was looking good.
Face Detection and IVS supported on this one. SmartIR & up to 40960 bitrate, should you ever need that

hahahah
Also of note is this does unlock a 3rd stream where this cam is usually limited to 2.
Now all I have to do is find the latest Lorex LNB9232 FW and I'll try flashing those old ones as well