BIOS 3A43 for Cranes II series of UMA MB (AS1690TM4020TM4100TM4600).

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To flash in Windows mode, pls install Winflash utility as in Winflash.zip.
To flash in pure DOS mode, pls run PHLASH16 xxx.WPH mode=3 S

P.s.
If you're using DOS bootable floppy (wo himen.sys) created in Windows XP, 
you will get an error like can't present memory manager while you 
update the BIOS (ie himen.sys)

You may do either one of the two ways to resolve
1. press F5 to bypass himem.sys 
2. modify the parameter from S to X 

The parameter  X  for PHLASH is Ignore XMS memory manager check.
The parameter S PHLASH is Silent operation (Turn off speaker).
