upgrade CM Motorola 5100 from 0.3.1.3 | docsis.org

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upgrade CM Motorola 5100 from 0.3.1.3

Hi, i have problem with upgrade cm motorola.
I have old motorola modem with FW SB5100E-0.3.1.3.
I need upgrade to 2.3.6.0 - but log write incompatible FW.
If I try "between-step" ~ upgrade from 0.3.1.3 to 2.3.1.8 result is some (log write incompatible FW)..
I have available this FW:
SB5100E-2.3.6.0-SCM00-NOSH-NNEMN.p7
SB5100E-2.3.1.8-SCM00-NOSH-NNEMN.p7

I upgrade by CFG files.
Next question, how is diffrence between FW.bin and FW.p7? Can I use i cfg file *.bin
Can you help me?
THX Martin