How to dump fastboot compatible system.img - Android Q&A, Help & Troubleshooting

Hi,
Our device mfg has neither released kernel source nor the stock system.img. So in any case if our phone is bricked we can not revive it. I am searching a way to dump the system.img which is compatible with fastboot. Recovery.img and boot.img dump are working fine with fastboot. Please help/guide me to make a working/fastboot compatible system.img.

What's your phone? MoBo? Qualcomm/Ti/Intel/MediaTek processor?
Please give all the information please

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cache.img
fbootlogo.img
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fdl2
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nvitem_wcm
prodnv.img
recovery.img
sc77xx
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u-boot
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thank!!
UP!~~

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