Lenovo s850 root (mtk6582/4.4.2)

[Athos]

OK, it looks like something went wrong with the formatting that flash tool did.
I'm just comparing this to mine.

Preloader - OK
MBR - OK
EBR1 - OK
PRO_INFO - you have type: NONE, should be NORMAL ROM
NVRAM - you have type: NONE, should be NORMAL ROM
PROTECT_F, PROTECT_S - you have type: NONE, I have ext4_img (I think yours should be Yaffs_img)
SECCFG - you have type: NONE, should be NORMAL ROM
UBOOT - OK
BOOTIMG - OK
RECOVERY - OK
SEC_RO - OK
MISC - you have type: NONE, should be NORMAL ROM
LOGO - OK
EBR2 - OK
EXPDB - you have type: NONE, should be NORMAL ROM
PRELOAD - you have type: NONE, I think this should also be Yaffs_img
ANDROID - OK
CACHE - OK
USRDATA - OK
BMTPOOL - you have type: NONE, should be NORMAL ROM

Your ANDROID, CACHE, and USRDATA are of type YAFFS_IMG
Could you check if the scatter file of the ROM you flashed have these formats.

I'm listing this here because I don't currently have an answer for you as to how to properly format each partition. Hopefully someone with experience with this can help out.