Be specific please, not just: "did not work".
In the thread you posted in before:
https://www.mobileread.com/forums/sho...93&postcount=1
Which of the steps did you follow (other than installing a new eMMC) and what was the result of each.
When you re-built u-boot, did you follow the directions in that first post about modifying the code?
Do you have your modified u-boot code posted in a public repository?
Where?