[General Questions and Answers] breakmycurse:
after having twrp 2.7 i tried some roms had md5 error,so after a search i wanted to try wanamlite rom wanamlite-xxufnbe-v2-4-android-kitkat-4-4-2-xposed.after installing wanamlite rom it has asked me to reboot.so i did reboot it.it had adam kernel 2.1 version.

i was expecting the device will reboot but thanks to at&t for making odin useless + making twrp useless as well.it had a message on the screen and it was written ''samsung custom'' with a locker logo open.i thought i have to wait for the first boot and be patient and after waiting about half an hour still nothing.(on the left up of the screen written red : kernel)i checked more than maybe hundreds of threads to find an answer about at&t sghi337 galaxy s4 and some ppl say i have to change the kernel.and some say i have to change it to at&t kernel i searched again for an at&t kernel i found a file name KT-SGS4-TW-JB-ATT-06-06-2013.zip.then i gave a try to that.but suddenly i realized i have lost the ability of booting to twrp 2.7.all i have left with is twrp 2.6.00 when i press volume up+home.still lucky to have it.i used that kernel reboot and got a message on the screen ''system software not authorized by at&t''.then i started searching again ppl say about loki doki.downloaded the file and flashed it on at&t kernel this time it showed samsung logo appeared and the boot sound which you know all of us familiar with and samsung led was blue.the led was like it is a pounding heart coming on and off.this should be the first load of the rom i thought again and waited and got no result.it didn't load again.failed failed and failed many times.

i also tried this file named MDOB-KERNEL2STOCK-LIB.zip.flashed it no result again.failed.this result was another strange thing.it was showing samsung custom logo boot it with sound and then turn the device off after 10 seconds.and repeats the process.reboots sounds and reboots again and again.

questions :

1) do i have a bootloader locked device?since i can't use odin to flash anything.(odin version 3.09) and if i have what can i do to fix it?

2)since i only have twrp 2.6.00 how can i upgrade it to 2.7 back with twrp.i mean twrp update using twrp.

3)with twrp 2.6.00 i used wanamlite rom kitkat version.and it says it has flashed it.but can it flash roms succesfully enough like 4.4.2?if it says it flashed everything is ok? or it misses some important features to make the rom work.what is the maximum capability of twrp 2.6.00.Do i have to try roms like 4.2.2?

4)about kernels with at&t i337 galaxy s4 what can i do?what should be the reason preventing the rom load successfully?if i have access to twrp does it mean i don't have to mess with bootloader cos i have already passed that step and got an interface for loading roms?i mean everything is ok with bootloader if i have twrp installed user interface? and after flashing a rom do i have to use the specific kernel coming with the rom or can i use any kernel for the device like stock kernels(doen't allow me to load) with loki doki or some kernels with loki doki?

i am so helpless,please enlighten me with your knowledge.any moderators or any developers can answer me?or help me?

stuck in the middle of nowhere.please help.