AFTER BECOME 3D FLASH COMPANY HAVE A BIG BENEFIT 
FOR EXAMPLE 
FOR 32GB USB3 .SILICON POWER MARVEL M50 
IN 2013 =SM3267 +ORGINAL INTEL L74 (4CE)
IN 2014=SM3267 +SANDISK TLC (2CE )
IN 2020 ALSO LOW COST CONTROLLER +DOWNGRADED NAND 32GB (ONLY 1CE )
OK 1CE TLC ?? MAXIMUM WRITE SPEED IS 10MB (SOME SAY OH NOT 8T23. I WORK 2 YEARS 8T23 
IN 3D FLASH JUST INTEL MICRON MLC L06 IS VERY GOOD EACH 1 CE (MLC 16K 3D CAN WRITE SPEED 30MB 
HOW EVER
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after extract nand i read it (8t22 98 3c 98 b3)
install on big controller 2251-09
8t22 can work vccq =3.3 volt 
but do remember 
intel n18 l06 and b16 b17 vccq must 1.8 volt 
if you put 3.3 on im flash may be nand is destroyed 
in smi r44 for 3d (1.8)volt 
but i just install nand and work normal and 
it is very easy 
and copy all important file 
WE NEED 2251-09-26 DATA (HAVE IMPORTANT FAMILY WEDDING MOVIE
I HAVE ANOTHER 2251-09 BUT THIS MODEL HAVE LM3020 IC TO 1.8 VOLT VCCQ 
SO FIRST EXTRACT NAND FROM 2251-09-26
AND INSTALL ON OTHER PCB