Zombie Redshirt wrote:

... why would he try again knowing it won't work?
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How can you assume it won't work again? There were a number of human factors that caused Lal v1.0's failure. Again, creating Lal v2.0 would have a more positive environment than Lal v1.0 had. Like I said in my previous post, Data would receive support and resources from his well-placed and -connection contacts:
- Commander Bruce Maddox
- Vice Admiral Anthony Haftel
- Crew of the Enterprise-D/E
- Lieutenant Reginald Barclay
- and various friends Data has made in the past
Back to the OP. Gastrof probably has the best answer why Data didn't make Lal v2.0:
gastrof wrote:

Juliana Soong saw Lal's photo, found out who the girl in the picture was, and asked Data to promise her he'd never try to create another android ever again.
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Why Juliana made such a request still puzzles me? What a shame Data agreed. Because I don't know if I can accept T'Preea's answer.