yes i was wrong... 1B not downgraded.
my downgrade history.
1. dump 3.70
2. downgrade E3 Flasher.
3. Brick
4. Recover 3.70
5. PS3 Working.. Update PS3 to OFW 4.00
6. Dump 4.00
7. Change HDD 160GB to 500 GB
8. Update 4.00 to 4.00
9. Dump 4.00 v2 (corrupt)(I later learned)
10. Downgrade E3 Nor Flasher (this forum instructon)
11. Brick
12. Recover 4.00 v2 (corrupt) PS3 Black screen
13. Recover 4.00 PS3 Shutdown
14. Recover 3.70 PS3 Shutdown
PS3 can't recover ?