[Asus  Eee Pad Transformer Prime] georgecoat:
Thank you alesi80 for suggestions.

The problem is that when I fastboot twrp recovery and reboot I will get to system bootloop again.

If I fastboot twrp and without rebooting select RCK I will get into twrp.

Then when I try format data I get this:

E: Unable to find partition size for 'misc'

E: Unable to find partition size for 'staging'

E:Primary block device 'dev/block/mmcblk0p8' for mount point '/data' is not present!

E: Unable to find partition size for '/recovery'

E: Unable to find partition size for '/boot'

E: Unable to set bootloader message.

Failed to mount '/data' (Invalid argument)

Unable to resreate /data/media folder

Updating partition details...

Failed to mount '/system' (Invalid argument)

Failed to mount '/cache' (Invalid argument)

Failed to mount '/data' (Invalid argument)

...done

Unable to mount storage

Failed to mount '/data' (Invalid argument)

Failed to mount '/cache' (Invalid argument)

Kernel does not have support for reading SELinux contexts.

Failed to mount '/cache' (Invalid argument)

Failed to mount '/cache' (Invalid argument)

Unable to mount /data/media/TWRP/.twrps

MTP Enabled

Failed to mount '/data' (Invalid argument)

If I try to flash ROM I get this:

mount: failed to mount /dev/block/mmcblk0p1 at system: Block device required

ApplyParsedPerms: lsetfilecon of /system/xbin/zcat to u:object_r:system_file:s0 failed: Operation not supported on transport endpoint

set_metadata_recursive:some changes failed

Updater process ended with ERROR: 7

Error installing zip file '/external_sdcard/Download/KatKiss-6.0_TF201_028.zip

Updating partition details...

Failed to mount '/system' (Invalid argument)

Failed to mount '/cache' (Invalid argument)

Failed to mount '/data' (Invalid argument)

...done

Unable to mount storage

When I try to wipe cache and dalvik I get this:

Failed to wipe dalvik

Updating partition details...

Failed to mount '/system' (Invalid argument)

Failed to mount '/cache' (Invalid argument)

Failed to mount '/data' (Invalid argument)

...done

Unable to mount storage

Failed to mount '/data' (Invalid argument)

Failed to wipe dalvik

After all of this I tried to format again and get this:

Unable to open ' ' to wipe crypto key

Unable to wipe DAta.

Unable to format to remove encryption

Updating partition details...

Failed to mount '/system' (Invalid argument)

Failed to mount '/cache' (Invalid argument)

Failed to mount '/data' (Invalid argument)

...done

Unable to mount storage

---------- Post added at 03:15 AM ---------- Previous post was at 03:03 AM ----------

Thank you TacoNikky, I tried format, wipe dalvik and cache and flash the ROM and it failed in all cases (the log is in this post).

When I fastboot twrp recovery and reboot to system it will get to system bootloop again.

When I fastboot twrp recovery and fastboot reboot-bootloader and select RCK it will start TWRP start screen and suddenly reboot to system and continue in system bootloop again.

When I fastboot twrp recovery and reboot manually to recovery (pushing volume down) it will start TWRP start screen and suddenly reboot to system and continue in system bootloop again.

If I fastboot twrp and without rebooting select RCK I will get into TWRP. But then whatever I do in TWRP it will fail.

As soon as I reboot I am in system or twrp bootloop again.

How to get out of this, is there any way please?