actually i don´t believe that this is the correct way (flasher -r "raw rootfs image" from PC) for recovering rootfs.

i tested the szenario on my device and my test ended up with a bricked rootfs. so i did some research and found that the correct format of flashing rootfs in this case (=from PC) is ubifs!
conclusion: i have to convert the raw image into ubifs format for successful flashing of rootfs via PC according to this post
can anyone confirm this conclusion or post his success story including all steps (flasher -r..)?

greets