Raspbian sd boots on raspberry pi on model a but not model b+ or pi 2?

I have an image of raspian that boots great on my raspberry pi model a, but not on my model b+ or my pi 2. When i try to boot on pi B+ or pi 2 i get a constant green light that stays on which tells me they are not reading the bootcode i would think. This is more about learning to me. What im asking for is a list of numbered steps in which one would take to manually create a raspian boot sd from a debian command line with an emphasis on the following: 1) format the sd correctly with fdisk or any other good commands. 2) get the right MBR code and add it to the disk using dd or another good command. 3) how to check the MBR code for correctness. 4) how to make sure the rest of the boot code is ok. 5) transfer the raspbian.img to the sd card. 6) important things to look for when examining the sd boot card after i think its finished. 7) which boot logs to look at for a thorough review of what the pi is doing while it boots.
Im mainly after a good list of ordered steps and the commands. I do not necessarily need an explanation for each step as i will research each command and step myself. Any explanation of a step is extra and much appreciated.
Lloyd Finckbone JrAsked:
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Lloyd Finckbone JrAuthor Commented:
I switch multiple cards between the pi model a, b+, and pi2. every card works on pi model a but not b+ or pi 2, so I assume its got to be a difference in the boot process itself, also noobs SD card works fine on all the pi's. I need other OS's to boot tho
Is it possible unit is defective?
Don't those rasperries use different CPU's? Usually the OS's need to be adapted for the proper CPU, and if it is the wrong OS for the CPU it wouldn't boot properly. This wouldn't have anything to do with MBR's etc., but you'd rather have to get the correct version of OS for your device.

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Latest release from raspberry site says it is compatible with all versions of HW
Lloyd Finckbone JrAuthor Commented:
while logged in my old custom raspian on pi model a:
sudo apt- get update,
sudo apt-get upgrade,
sudo apt-get dist-upgrade,
sudo apt-get install raspberrypi-ui-mods,
works on all pi versions,
saves old mod a raspian with configs and files,
also backwards compatible with pi mod a just a little slow tho,
Lloyd Finckbone JrAuthor Commented:
update and upgrade raspian while on old raspian pi model a works
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