You are clearly trying to swim in very deep waters and while I admire your persistence, I have very strong doubts you will get there by your current "help me I am drowning" approach.

You may have a boss coming to you every 10 minutes asking "when is it done" and that, I know, is very painful.

HOWEVER, to learn to swim, you must first get to where you can stand on the bottom, or you WILL drown.

So, here is my advise: take the editor, assembler and compiler off the screen and try to forget all efforts so far. Read and absorb "the bible", especially chapter 3, read and absorb the IAP chapter in the datasheet and do not forget an419.

Then, next week, without looking at what you already have code up a simple program to write "qwerty" to somewhere in flash, make that work and then, and only then include the flash write in your main program.

I know, this sounds 'wrong' but, believe me, every time I have approached a problem the way you do I have failed. Now, older and (hopefully) wiser, I simply refuse to panic, actually I work SLOWER when I have a problem than when I do not and that has led to much FASTER problem resolutions.

Good Luck.

Erik