(STEP 8)

(STEP 9) You can see that there are all 0 on the memory, it is why the screen display black. We change the first line to FF, convert to BIN file again and save.

I can convert to HEX and change the first 2 characters to FF as suggested, but when I try to revert, it gives an error that it can't go backward. I attempted to %!xxd -r -p in order to get it to work, this did revert it back, but left odd symbols between sections of the code.
However, the following step (Step 10) "sudo cat fb.fb > /dev/fb1" gives an error that the files is too large and fails (this message came up prior when I accidentally added the %!xxd as an insert at bottom of file as well). Therefore I can't continue any further. And when I went ahead and finished the processes, I am stuck on a white screen. I am doing this on a Pi Zero W with 32gb MicroSD.
Any Suggestions?
I should also note, that in Step 6, prior to converting to HEX, it is supposed to display geometry as 128 128 128 128, however, I get different variables
(STEP 6) As the image above, the resolution 128x128 is correct. However, others are wrong like the size is 32768 in fact but not 65536.

I've been trying to figure this out for a while now, so any help would be very appreciated.
~3X-M4ch1n4