Failed to change /cache file system from ext4 to f2fs

Hi guys... i want to ask whether anyone know how to solve this error,....i was succeed to change file system of /system and /data from ext4 to f2fs but i've got this error message after i'm trying to change file system of /cache by using twrp v2.8.70 :

E: mkfs.f2fs -t 1 /dev/block/mmcblk0p4 process ended with ERROR=255
E: Unable to wipe '/cache'
E: Error changing file system.

Thanks in advance for your attention :)

How to extract your system.img with ext4 unpacker on Windows

Extract any app or system files in Windows with ext4 unpacker.

Very useful if you delete accidentally system app or you need to extract build.prop and local.prop

Works great on my Win 10 pro .

Using Huawei Update Extractor to extract from Update.app system.img on any firmware H60

After extracting system.img open ext4 unpacker and select it

Right click and select the folder or file you want to extract

Source:

http://en.miui.com/thread-45711-1-1.html

Download

http://sourceforge.net/projects/andr...urce=directory

Changed /system to f2fs, cannot change back to ext4

I changed /system partition to f2fs for using temasek. Now I want to change it back to ext4. I converted all the other partitions to ext4 successfully. But when I try to change /system to ext4, it appears to go successfully. However, when I reboot, it still shows f2fs in the TWRP recovery.
I am using latest TWRP recovery (2.8.7.0_7 I believe).
Can anyone help me on this?