Hi Archie, thanks for your answer,
=> ON
Please try once: OFF
When I do that, the blue font appears and then a blue screen with android avatar and a circling arrow, and then collapsed android avatar with yellow sign with /!. And then, a few seconds away, the screen you described, with a few options available with volume up and down appears.
Should I adb reboot recovery from this screen and then adb sideload filename.zip ?
OK! I’m trying this thanks a lot !
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Wiht OEM off, same error while downloading twrp, trying to reboot on recovery…
I just remembered: is your Samsung Reactivation Lock active or no?
Do you also have the possibility to work with a Windowc PC + Samsung ODIN? I have much more experience with this configuration than with Ubuntu 19.10 …
I don’t have this setting on my android, probably not anymore from 8.0.0
Unfortunately I don’t have access to a windows pc… sorry…
I was wondering if a factory reset could be useful before trying the whole process again ?
Another thought:
If (Remote Monitoring and Management) RMM Locked or you can not see OEM unlock options in Developer options. RMM will prevent us from installing custom recovery and custom ROM as well as preventing rooting.
RMM features a lot of samsung firmware updates starting in January 2018. It also does not exist on all models samsung galaxy.
To find out this feature exists or not in your samsung galaxy device by enabling Developer Options. If there is no OEM unlock option in Developer options it is possible that the feature is on the samsung galaxy device in locked state. This means you can not install custom recovery such as TWRP recovery and custom ROM.
Make sure your phone isn’t RMM Locked.
I would like to downgrade Android 8.0.0 Oreo to StockROM 7 nougat and then install TWRP-for-herolte and /e/OS e-0.7-n-herolte. But of course there is always a certain risk …
Let’s wait for an answer from @donut3. He probably flashed his Samsung S7 successfully.
Hi @charlyox, i just tried to install Heimdall based on the instructions in the tutorial which point to the readme on Gitlab and was able to install Heimdall-front end. do not have samsung device so not sure how it works .
Next when you type it shows an error but load the below UI
$ heimdall-frontend
Gtk-Message: 06:04:20.552: Failed to load module “canberra-gtk-module”
Hello @Manoj,
I installed frontend version of Heimdall, and tried to flash twrp from it, but it did not seem to work…
Thanks for your help !
Hello @archie,
I don’t have any mention of RMM on the download mode screen. Not sure of what it means…
The link you mention speaking about donut3 says One does not need to use Heimdall. I think that’s good news. I’ll try to download directly twrp from adb / fastboot instead of Heimdall.
Thanks a lot anyway guys for your help, any oother idea would be appreciated.
Without any new idea I’ll try to flash a fresh firmware (any idea where I can get it ? On samsung’s website ?) and try the whole process again this evening.
I used a version of heimdall (I think) in the terminal, with the command
~$ sudo apt-get install heimdall-flash
This terminal version worked very well.
You could try using this command, and then
~$ heimdall flash --RECOVERY twrp-3.3.1-0-herolte.img --no-reboot
(of course, you need to have TWRP downloaded and moved to home folder for this command to work)
Try these commands and see if it works… This was my exact procedure!
Exactly what I did… Not with same success 
@charlyox, I know, you don’t have access to a windows pc… but I can @Anonyme only agree …
[HOWTO] Install /e/ on a Samsung smartphone with Windows easily using the example of Samsung Galaxy J5 2015.
Did you install the heimdall-flash package in terminal?
Once you flashed TWRP with the heimdall-flash, did you immediately boot into recovery?
Yes, you are probably right. I will give it a try tomorrow morning for there is a windows pc at my office.
While reading your link, I realized that I perhaps have a phone reference not available for twrp : SM-G930U
If you check this : https://twrp.me/samsung/samsunggalaxys7.html
these are ok : SM-G930F, SM-G930FD, SM-G930X, SM-G930W8,SM-G930K, SM-G930L, SM-G930S, but not mine.
I will check this evening if I may have a twrp for my SM-G930U.
In the meantime, does one know where I can find a twrp for my SM-G930U ?
I think this is the problem…
Yes, I agree with you… I think that is definitely the problem. I unfortunately do not know of one for your device off hand, look on twrp.me and xda-developers.com. Hope you can find one…
EDIT: I just found this link, look at here:
https://forum.xda-developers.com/galaxy-s7/samsung-galaxy-s7-roms-kernels-recoveries--other-development-snapdragon/recovery-official-twrp-galaxy-s7-t3458579/page1
hope it is helpful for you!
Be careful with the bootloader, I’m reading alot about it might be locked.
Yes!. Und you have indicated the model Galaxy S7 SM-G930U at theme opening - and I have also overlooked it…
It seems that the only option is to roam Android 8.0.0 Oero and free the system as much as possible from G°°devils. The security patch levels of September 2019 will probably only be a small consolation …
Arg. F**k.
Just to be clear, as I am not a techie myself : no way to install other than Android itself ?
@archie, just to understand. Is it just not supported by /e/ but could be in a matter of time ? Or can’t it be supported because it is “unlocked” and it technically can’t accept a new ROM ?