[Samsung Galaxy A3, A5, A7 (2017) Questions & Answe] angry_goldfish:
I also have one of these phones. I got it from HSN for $35 awhile back along with a Tracfone plan.

I have not done anything with mine yet, but I would like to figure out how to get a GSI or other custom image on it some day.

Are you sure you have a TFN version and not TFV? Mine says it's a "Model SM-S135DL (GP), GPSAS135DCGB, FCCID: ZCASMA037U", Model Code: SM2S135DZKATFV, and it came with software S135DLUDU1AWG4, Build number TP1A.220624.014.S135DLUDU1AWG4.

Here's the download link for the version that apparently came with my phone:

https://samfw.com/firmware/SM-S135DL/TFV/S135DLUDU1AWG4

Actually, nevermind. It looks like the md5s are the same, so despite the model/name difference, it's running the same software.

My research indicates these dumb little Samsung MTK devices don't have an unlock option because the bootloader isn't really locked, or meant to be unlocked anyway.

Samsung Galaxy A03s: No OEM Unlock option in developer settings

My A03s isnt showing the OEM Unlock option is developer settings, even though its unlocked

xdaforums.com

"Is it the mediatek one? Oem unlock doesn't matter anyway. I've had 2 of these phones and you can just plug it in to a tool like mtkclient and boom you've unlocked the bootloader with no oem option. Unlocktool can also network unlock that phone too."

Here's some other links and research I did for this model

Samsung A03s

Guys is there any custom android 12 rom available for A03s if yes inform me thanks

xdaforums.com

Samsung Galaxy A03s - Full phone specifications

www.gsmarena.com

Galaxy A03s / A04+e /

You can view and join @Samsung_A03s_A03s right away.

t.me

Galaxy A03S Bootloader

Recently I bricked my A037F by downgrading from android 13 > 11 using an MtkClient backup, now it will no longer turn on or display anything, and I can't get into Odin. I suspect it is because of an anti rollback system. I would greatly...

xdaforums.com

[ROOT][MAGISK v23.0] Samsung Galaxy A03s SM-A037F

ROM Firmware : SM-A037F_XID_A037FXXU1AUI7_fac - Unlock Bootloader ( Need ) - Wipe data - Download Mode - Flash it with Odin in AP For a tutorial on how to manually patch a rom with magisk, read this "Magisk Tutorial"

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Samsung Galaxy A03s

Hey Guy's let's help me how I can root my Samsung Galaxy A03s and how i can find the image of twrp in my phone.

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Samsung A03s roo issues

Hey I am trying to root my sm-a037w, fully updated. I remember having OEM unlocked it using the developer option which is now gone completely. I'm using Magisk to patch the AP file Then use ODIN to flash it and it stops at vbmeta with a error...

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Accidentally bricked my SM-S134DL (Samsung A03) with BROM

Hey folks, I've been trying to root my SM-S134DL with Magisk, but it doesn't have the OEM unlocking option (it's a Tracfone phone, so that's why) so I needed to unlock the bootloader. I've tried many different programs and I was able to remove...

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Samsung A03s preloader loop

I managed to brick my Samsung Galaxy A03s and all I have figured out is that the preloader connects to my computer for 2 seconds and then disconnects for 10 seconds. I have tried at least 8 tutorials on how to fix it but they are either for...

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Updating Samsung Galaxy A03s (SM-A037U)

1. Mode Name: SM-A037U 2. One UI Core Version: 5.1 3. Android Version: 13 / A037USQS5DWI2 / A037UOYN5DWI2 4. Carrier: US T-Mobile (Network Unlocked, Bootloader Locked) Since Android 14 just realeased and it seems that Samsung isn't going to...

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Samsung Galaxy A03s: No OEM Unlock option in developer settings

My A03s isnt showing the OEM Unlock option is developer settings, even though its unlocked

xdaforums.com

[Samsung Galaxy A03] Rooting and GSI installation guide

This guide is for Samsung Galaxy A03 only and assumes you have updated to the latest firmware. While it has been tested with SM-A035F, it may also work on SM-A035G and SM-A035M. Proceed at your own risk. Back up your files as all your data will...

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Samsung OEM crapware list for uninstallation

https://www.google.com/search?q=samsung+android+bloatware+list+disable

https://www.minitool.com/news/list-of-samsung-bloatware-safe-to-remove.html

https://gist.github.com/patrickdappollonio/d86b47f2edb1e4a9be8696e0eb466a60

https://github.com/khlam/debloat-samsung-android

Good luck. Let me know if you ever get it figured out. I just don't have the time to play with mine right now, but eventually I'll start working on it to see what I can do.