Ok so I had to replace my ecu and I replaced it with an ecu with the same numbers
MY ECU 4Z7907551R ME7.1.1 0003
EBAY ECU 4Z7907551R ME7.1.1 0003
I done a full backup of new ecu with ktag which katag does not read the eeprom so I also saved a copy with ME7eeprom.exe then I did a full restore with ktag of original ecu backup then I did a restore of original eeprom bin with ME7eeprom.exe. After that I wanted to do a read with nefmoto just because lol... well after i did the read and saved file but ecu in car and no start.. checked codes and yup P1681 I tried doing the read the ecu writing back to ecu with nefmoto and ktag and none of that worked. The one thing that did take care of the issue was to write the eeprom bin back to the ecu with  ME7eeprom.exe turn car of then back on and start code gone...

now after all that im wondering if I should have not done anything to replacement ecu except write eeprom and go
also it seems the new ecu had a tune because in eepromtool.exe the bin for the new ecu says
Tuner Tag:  ←Cx |

Its the first post in this thread...

Here's the fix.

Open your file in a hex editor and find the follwing string:

"DB 00 28 02 84 00 ?? ?? C2 F4 ?? ?? 66 F4 80 00 2D"

After finding this, change the last byte from 2D to 0D

Example:

Before:
F4   80   00   2D   0D   E6   F4   F0   A5

After:
F4   80   00   0D   0D   E6   F4   F0   A5

Ok I think I may have found my mistake. I found a match at the very end of the flash. That was my issue I was modifying elsewhere. Thanks again.

In my case it was located at 0x00088220 thru 88230. I was editing in the wrong spot earlier which would explain all the issues I was having.

Yes I was using a generic hex editor took forever to find lol. But got it sorted out thank you for confirming.

Ok and?

The string is a few bits off, however it was still easy to find...
File attached