Relock bootloader on Samsung Tab S5e - Samsung Galaxy Tab S5e Guides, News, & Discussion

Hi all, new here. I’ve been advised to visit here to get support since I’m not familiar with the competency.
I acquired a second hand Samsung Galaxy Tab S5e. It arrived with its bootloader unlocked. Apparently an attempt to install a custom ROM had been trialed but not completed.
I would like now to relock the bootloader cause it‘s preventing some apps to function properly, as a security measure.
Screen at boot
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
I don’t know how to do it and failed to manage to get help online (Reddit & co)
Any guidances please ? Thanks for your time

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Viro_Major said:
Hi all, new here. I’ve been advised to visit here to get support since I’m not familiar with the competency.
I acquired a second hand Samsung Galaxy Tab S5e. It arrived with its bootloader unlocked. Apparently an attempt to install a custom ROM had been trialed but not completed.
I would like now to relock the bootloader cause it‘s preventing some apps to function properly, as a security measure.
Screen at boot
I don’t know how to do it and failed to manage to get help online (Reddit & co)
Any guidances please ? Thanks for your time
Click to expand...
Click to collapse
Check the version you have on the device at the moment and download stock ROM for your device and flash with odin.
The reason is if you are on pie (Android 9) you can upgrade to (Android 10) but not vice versa.

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Hi. I’m on Android 10 already
isn’t there a way without formatting, losing my apps/settings ?

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Viro_Major said:
Hi. I’m on Android 10 already
isn’t there a way without formatting, losing my apps/settings ?
Click to expand...
Click to collapse
No. Re-locking the bootloader will cause a "factory reset". If you still haven't found out how, look for the unlocking instructions in the Questions thread. The same instructions work to re-lock.

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lewmur said:
No. Re-locking the bootloader will cause a "factory reset". If you still haven't found out how, look for the unlocking instructions in the Questions thread. The same instructions work to re-lock.
Click to expand...
Click to collapse
Hi, I have the same issue. Where is the "Questions" thread located ? Unable to find it. I'm lost
---------- Post added at 06:09 PM ---------- Previous post was at 05:59 PM ----------
In the end, I found the Q&A sub-forum but not the "unlocking instructions" topic that was talked about. Can anybody direct me ? Thanks

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Viro_Major said:
I would like now to relock the bootloader cause it‘s preventing some apps to function properly, as a security measure.
Click to expand...
Click to collapse
LindaS said:
In the end, I found the Q&A sub-forum but not the "unlocking instructions" topic that was talked about. Can anybody direct me ?
Click to expand...
Click to collapse
As mentioned above locking the device will wipe it. Second the device must be entirely factory, restore it with Odin (is likely the best idea). If it is not, you're going to have a bad time. Next I must admit, I've never done this, as I've never had a desire to run factory software... So you've been warned... you're on your own. OEM unlocking must still be enabled. When you go back into the Unlock section (plug in USB, holding all buttons) you should be greeted with a screen but this time asking if you want to lock the boot loader. Note, Knox will still be tripped even if you lock the bootloader. At least that is my understanding, so you will not be entirely stock, and certain apps still will not work (payment apps).
Personally if it were me I'd say you're almost better off trying a custom ROM like Lineage, and use a custom fingerprint so the device comes up as certified. I don't have any apps that don't work. However I guess it all depends on your use case. Remember locking your bootloader is risky.

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LindaS said:
Hi, I have the same issue. Where is the "Questions" thread located ? Unable to find it. I'm lost
---------- Post added at 06:09 PM ---------- Previous post was at 05:59 PM ----------
In the end, I found the Q&A sub-forum but not the "unlocking instructions" topic that was talked about. Can anybody direct me ? Thanks
Click to expand...
Click to collapse
Unlock bootloader instructions and look in section four.