TWRP 3.0.3 at the post number 17 !
PLEASE FOLLOW VERY CAREFULLY THE NEXT STEPS
Make sure to have installed the OTA "full_k15ta_a-ota-1484567521.zip" (201701) !
1) Download the TWRP 3.0.2 at the next link :
http://www.mediafire.com/file/ya6ql5kcqtqy1h9/Apollo_twrp_3.0.2.rar
2) Install the adb drivers and fastboot commands :
http://www.mediafire.com/file/2df821420xpdp48/ADB_1.4.2.rar
Unrar the rar. Run “adb-setup.exe”. Hit “Y” to all 3 questions.
3) Tap on Settings --> About phone --> Tap Build number seven times.
Developer options --> OEM unlocking enabled and USB debugging enabled.
4) Download SuperSU.zip and BusyBox.zip at the next link :
http://www.mediafire.com/file/g4hubpximcn2g1b/LAST_SU-BU.rar
5) Unrar the rar. Copy the 2 zips onto your microSD.
STEPS TO DO ONCE ONLY :
6) Plug your phone to PC via USB cable.
Allow the pop up request on your phone to give your PC USB debugging.
7) Open CMD (command prompt).
8) Type the next command :
adb reboot bootloader (and press enter)
9) Now type the next command :
fastboot oem unlock (and press enter)
10) Press volume up (into your phone) to confirm to unlock the bootloader.
You will see in the CMD prompt the next messages :
"Start unlock flow", and when it will be finished, you will see "OKAY".
11) Reboot in normal mode (be patient, when you unlock the bootloader, the phone reset to factory).
12) Now tap 7 times on Build number. Then Developer options, and re-enable OEM unlocking and USB debugging.
STEPS TO DO EVERY TIME YOU NEED TWRP RECOVERY :
13) Copy the TWRP (recovery.img) into the same folder of fastboot.exe and adb.exe ( c:\adb\ ).
14) Connect your phone to the PC via USB cable.
15) Open CMD (command prompt) and type the next command :
adb reboot bootloader (and press enter)
16) Now type the next command :
fastboot boot c:\adb\recovery.img (and press enter)
17) Onto TWRP, if asking you to swipe to allow modification of System, tap KEEP READ ONLY.
18) Now - the most important thing - tap on Backup.
19) Check mark on Nvram, Boot, System and Data.
20) Tap on Select Storage, tap on MicroSDCard, tap on OK.
21) Tap Swipe to Backup.
22) Return to the main menù of TWRP.
23) Tap Install. Tap on Select Storage. Tap Micro SDCard. Tap OK.
24) Tap on SuperSU zip
25) Swipe to confirm Flash.
26) Tap on Reboot.
27) Tap on POWER OFF.
28) Turn on your phone.
29) Tap on the icon of SuperSU to activate it.
30) Download an app like "Root Check" or similar, to verify if phone is rooted.
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