Copyright (c) 2010-2017 Benjamin Dobell, Glass Echidna
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Setting up interface...
Protocol initialisation successful.
Some devices may take up to 2 minutes to respond.
Please be patient!
Downloading device's PIT file...
PIT file download successful.
RECOVERY upload successful
Releasing device interface...
The installation guide says:
A blue transfer bar will appear on the device showing the recovery being transferred.
Unplug the USB cable from your device.
Manually reboot into recovery:
With the device powered off, hold Volume Up + Power.
I get the transfer bar and it seems to be filled up to the end. Screen is on and still says downloading. Option is to press power and volume down for seven seconds to cancel … no other options.
Removing the cable does nothing, screen is still there.
When using option (press power and volume down for seven seconds) device powers down.
After this: device does not power into recovery when using (Volume Up + Power). Says software is not Samsung official and boots into Samsung Android …
Ok, not really a step forward.
The video is quite helpfull. I did it exactly as shown (or described in the guide).
But the immediate boot into recovery from bootloader by resetting with power/volume down and switching to power/volume up does not work for me.
It always complains in red text that the device is not running Samsung software and then boots into Samsung Android.
I suspect the problem is the already installed Stock Android 12 on the device (it came with that version already).
So I see two options:
wait until /e/OS S is released
downgrade the device to Android 11 before switching to /e/OS.
I bought this device because I liked the idea of having a tablet with eOS, but as the user ne20002 exposed, after the step of sending the recovery.img file version 1.8 with the help of heimdall I tried several times to reboot in the recovery menu, but without success, no matter how fast I pressed the keys VOL DO + POWER and then VOL UP + POWER, as it always continued with the “normal” start screen of samsung.
I think I repeated this procedure so many times that unfortunately it now somehow seems to have corrupted the “boot”, as it now stays in a loop.
Then I tried to install the other recovery images (1.5, 1.6, 1.7), but the result was the same.
I don’t know if it will help, but I can still enter the menu to use heimdall and install a new recovery.img file, and my intention would be to hopefully re-install some original version of samsung, but I have had no luck in my search on the internet. Does anyone know of a place where I can recover these files?
I know of no Official Samsung source of Stock ROMs.
Edit. It is also worth considering how new your device actually is.
Flashing /e/OS to a brand new Samsung
The 7-day buffer period discussed in this section will impact users of a brand new phone. During the Prenormal period, you can NOT flash any non-Samsung binaries. It would be a good idea to use the phone with a SIM card and online with wifi during this period. Source Know your hardware - Samsung Of course in the case of a WiFi tablet SIM does not apply, but connection to Remote Monitoring is still a factor.
You need to ensure the device is on Android 12 (not Android 13) before attempting to install e-1.9-s-20230311268558-dev-gta4xl.zip
Perhaps you could clarify … is the loop to Odin / Download mode only, or something else.
For anyone else who is looking into this lately, the May 2023 stock Android 13 update (build date 2023-04-28) seems to have bumped the firmware “security patch level” to 3 on the Wi-Fi tablet (SM-P610, gta4xlwifi) and 5 on the LTE tablet (SM-P615, gta4xl). Once you have this version I believe it’s not possible to downgrade the firmware to Android 12 for /e/OS. 
Thanks pete. Ironically, I installed lineageos4microg first, which is why I’d already upgraded to the latest Android 13 stock and bumped the SW REV version. . Happy to wait for the Android T /e/ OS release.