DOC TrueFFS driver

It is urgent!

We are now using DiskOnChip 2000 MD2200 - D24 and QNX version 4.25 OS. We
have received several
complaints from our customers about corrupted files found when customers
upgrade software on DiskOnChip. I get the information from M-Systems that
the compatible DOC TrueFFS driver we use should be version 5.0 but we are
now using
the version 4.24A. Can we use 4.24A DOC TrueFFS driver on DiskOnChip 2000

I will be appreciated if anyone can help.