What adjustments can I make to a V4 CFE to make it work on a v5 wrt. I tried
to adjust a v4 CFE but the router stays bricked

and yes i did save wholeflash.bin with hairydairymaid's utility that he update to support the WRT54G's
Samsung 2MB flash chip.

So i can unbrick it ,but i want to port wrt code to a v5 with an MMC mod so 

a) writeable filesystem
b) size only limited by mmc
c) V5 running linux
d) no firmware updates only modules and fixes
e) firmware updates only when changing the linux kernel version