[Transformer TF300T Android Development] yannmrt:
Hello I just finish to try again the installation, please see below all the detail:

Copy all file in SD card (64gb freshly format in exfat)

KatKiss-7.1_TF300T_015.zip

KatKiss-7.1_TF300T_015.zip.md5

UPDATE-SuperSU-v2.79-20161211114519.zip

open_gapps-arm-7.1-pico-20170107.zip

open_gapps-arm-7.1-pico-20170107.zip.md5

TWRP-> Wipe to Factory reset

TWRP Msg

Updating partition detail...

...done

Formating cache using mke2fs...

Done

Wipping Data without wipping /data/media...

Done

Updating Partition detail...

...Done

TWPR-> Format /Data

TWPR MSG

Formating data using make_ext4fs function (take about 35 MN)

You may need to reboot recovery to be able to use /data again

Updating Partition detail...

...Done

TWRP-> Reboot to recovery - Didn't reboot to recovery, reboot as system and stop at Asus Logo

I reboot manually to recovery (Vol Down + Power) the RCK

When reboot in Recovery I get screen "keep System read only" check "never show this screen during boot again" then swipe "swipe o allow modification"

TWRP-> Change files system /Data

TWRP Msg

Mount point /Data

Current file system EXT4

TWRP-> F2FS

TWRP Msg

Change Data to F2FS?

Swipe to change

Formating Data using mkfs.f2fs (take less than one minute)

Done

TWPR-> Back-> back... -> Reboot-> Recovery+-

Didn't reboot to recovery, reboot as system and stop at Asus Logo

I reboot manualy to recovery (Vol Down + Power) the RCK

When reboot in Recovery I get AGAIN the screen "keep System read only" check "never show this screen during boot again" then swipe "swipe o allow modification"

I check if /data is F2FS and yes it is.

TWRP-> install -> Select storage -> Ext_sdcard (60873MB)-> OK

TWRP-> KatKiss-7.1_TF300T_015.zip

TWRP-> add more zips

TWRP-> UPDATE-SuperSU-v2.79-20161211114519.zip

TWRP-> add more zips

TWRP-> open_gapps-arm-7.1-pico-20170107.zip

TWRP-> Swipe to confirm flash

TWRP Msg

Instalaing '/external_sdcard/KatKiss-7.1_TF300T_015.zip'...

Checking for MD5 file...

MD5 Matched

Script Succeeded: result was [/system]

Instalaing '/external_sdcard/UPDATE-SuperSU-v2.79-20161211114519.zip'...

Checking for MD5 file...

Skipping MD5 check: no MD5 found

***

SuperSU installer

***

...

- Done

Instalaing '/external_sdcard/open_gapps-arm-7.1-pico-20170107.zip'...

Checking for MD5 file...

MD5 Matched

###

open

gapps

###

Open Gapps pico 7.1 - 20170107

...

- Instalation complete!

- Unmouting /system

Updating Partition detail...

...Done

TWRP-> Wipe cache/dalvik

TWRP Msg

Press back to cancel

TWRP-> Swipe to wipe

TWRP Msg

Formating cache using mke2fs...

Done

Updating Partition detail...

...Done

Wipping Dalvik cache directories...

-- Dalvik cache directories wipe complete!

Updating Partition detail...

...Done

TWRP-> Reboot System

Reboot done and small installation with blue line done, then pass to the "Asus Logo screen" then stop!

Note this time in the "asus logo screen" I don't have any more "the devices is unlocked" on the top ??? Something went wrong some where ? Should I need to redo the unlocking?

Update, after to reboot "the device is unlocked" message on the "Asus logo screen" appear again, but still didn't go forward ?!?!?

Forget to mentioned, yesterday i try to install katkiss only, without covert /data to F2FS leaving as ext4fs after formatting, but still stop at Asus Logo screen!

Thanks for your precious time.

---------- Post added at 04:22 PM ---------- Previous post was at 04:18 PM ----------

To enter in Recovery I use Vol down+Power then choose "RCK".

Vol up+Power doesn't give anything to me.

Hope this help