[AT&T Samsung Galaxy S 4 Q&A, Help & Troubleshootin] WaLeC_TW:
Hello to all forum members. :highfive:

Recently I got into my hands the Samsung S4 SGH-I337 version of AT&T, at least I think so. The current version of Android on it is 5.0.1.

When I set the phone to recovery mode, I think I see the modem version: I337UCSGOK3. Correct me if this is not the modem version, but I am sharing it because I guess this information will be helpful to make alternative software installation.

I've already spent 7 days trying to change the software, reading one by one what I will find about such an update. I tried tons of instructions and they all didn't let me do upload/change somehow software nor even install TWRP.

Tried to upload TWRP (I think I found 6 different files) using different applications from the original Android system - Failed. ie. I used TWRP straight from the system, I also used Flashify. When I use this Flashify app I installed TWRP, but it didn't let my phone go into recovery mode, it just went straight to the download. For me it looks like there is something to not let flash/change this to TWRP.

I tried to upload TWRP via ODIN, it doesn't work, it crashes during installation with error messages.

I also tried to upload lineageos version lineageos.17.1.recovery.img via the normal recovery mode, but every time I try I get an error about the signature not matching.

I tried to upload the software by ADB, I have had connection, I was able to see the phone, but I can only use adb sideload recover.img command and although I tried different images and .zip files, unfortunately nothing works. I think I also get an error that the signature does not match.

Can I ask you for some hints, maybe some instructions that will really work. Many instructions were based on specific versions of the bootloader, is what I called the modem above maybe I named this wrong and this is the bootloader version? If so, does anyone know about the instructions for this version of the bootloader? It seems to me after my problems that it is strangely blocked. Maybe someone knows how to make it work. I would like to change the software to change the system language to Polish. Unfortunately, the apps: MoreLocale2 and Language Enabler and probably about 4 others from the play store are not working.

Of course, the phone is rooted with Kingoroot, the applications detect that there is root, after all, after selecting the Polish language, it does not work in the system.

I would like to change Androind 5.x to LineageOS, because there you can do much more and it works better, more efficiently and saves battery. And I will be able to change language defenetly.

this is not the first time when I do that things. I have changed the regular S4 jfltexx many times, this is not the slightest problem for me.

Summarizing:

1. I would like to change the language to Polish, if it doesn't work or it won't be possible, it's a waste of time or something else

2. I would like to unlock the bootloader and upload TWRP, it can be CWM if anyone knows it will work and has an instruction that I can test

3. Then I would like to upload lineageos.

I'd appreciate any hints to test these things above.

On page:

https://xdaforums.com/showpost.php?p=81418691&postcount=29

I read that it will be possible to upload TWRP, but if it is a special version of TWRP prepared for this phone. Will someone be so nice and tell me if something like this exists and if so, where can I find such TWRP for uploading via ODIN.

Thank yo all for your time spending to read this.:good:

PS: Dear Moderators if this thread is not in proper place please correct this. Thank you.