Database Users

[Q] how to update to lollipop with odin on locked bootloader S5

Hello Everybody
i bought an s5 on eBay with locked bootloader, it has no logo or carrier ,i have downloaded the compatible lollipop firmware from samfirware,now i am worried that if i flash it via odin than would i be able to boot normally with new bootloader?
can someone help me how exactly should i do?
plz help me friends.

Bootloader will be updated also if you'd flash a full and original Rom. I also updated that way with the first Rom for poland.
If your S5 is in the original status you're lucky. If youre rooted you'll loose root.
Just be sure to flash the right one for your model! Otherwise you might have a bricked device.
1. Download the Rom from Samfirmware/Samdownloads
2. Download Odin (3.09 or higher)
3. be sure the Samsung USB-drivers are installed on your computer
4. open Odin and bring your phone into download mode (vol- & Home & power)
5. Connect your phone via USB to your computer and be sure Odin shows up your phone as "ADDED"
6. Select the extracted file (your-rom.tar.md5) as AP
7. select ONLY "f. time reset" and "reboot after download" with marks.
8. Start the flashing process and wait till "succeed!" appears (there will be a "reset" before)
9. you can disconnect your phone now and enjoy Lollipop
I am not responsible for any bricks or fails of your phone. Flashing is ALWAYS on your own risk!
If unsure, search for a detailed Tutorial in the forum for flashing and updating to Lollipop.
Best regards!
Send from my G900F @ Ressurection Remix using Tapatalk.

sp3d00 said:
Bootloader will be updated also if you'd flash a full and original Rom. I also updated that way with the first Rom for poland.
If your S5 is in the original status you're lucky. If youre rooted you'll loose root.
Just be sure to flash the right one for your model! Otherwise you might have a bricked device.
1. Download the Rom from Samfirmware/Samdownloads
2. Download Odin (3.09 or higher)
3. be sure the Samsung USB-drivers are installed on your computer
4. open Odin and bring your phone into download mode (vol- & Home & power)
5. Connect your phone via USB to your computer and be sure Odin shows up your phone as "ADDED"
6. Select the extracted file (your-rom.tar.md5) as AP
7. select ONLY "f. time reset" and "reboot after download" with marks.
8. Start the flashing process and wait till "succeed!" appears (there will be a "reset" before)
9. you can disconnect your phone now and enjoy Lollipop
I am not responsible for any bricks or fails of your phone. Flashing is ALWAYS on your own risk!
If unsure, search for a detailed Tutorial in the forum for flashing and updating to Lollipop.
Best regards!
Send from my G900F @ Ressurection Remix using Tapatalk.
Click to expand...
Click to collapse
thank you for your help my friend,
will i get the same locked bootloader after flashing?
and what about stock recovery?
i mean will i be able to go in to reccovery mode?

What you will do is an update.
Everything will be at stock if it was before!
You're doing a official update and the Knox counter will stay at 0x0.
The bootloader will be stock (locked), the recovery will be stock and accessable.
This will be a S5 as you buy it in the store, just with Lollipop inside. ☺
I hope you told me everything about your phone. If it's not completely stock sth's might be different in flashing process!!
If you bought a non edited (no flash, no root) S5 everything should be fine. The bootloader is always locked.
Send from my G900F @ Ressurection Remix using Tapatalk.

sp3d00 said:
What you will do is an update.
Everything will be at stock if it was before!
You're doing a official update and the Knox counter will stay at 0x0.
The bootloader will be stock (locked), the recovery will be stock and accessable.
This will be a S5 as you buy it in the store, just with Lollipop inside.
I hope you told me everything about your phone. If it's not completely stock sth's might be different in flashing process!!
Send from my G900F @ Ressurection Remix using Tapatalk.
Click to expand...
Click to collapse
everything is as it was,i just rooted with towel root knox 00,installed safestrap recovery,
my stock firmware is G900FXXU1ANE2_G900FAUT1AND2_G900FXXU1ANE2
i downloaded the lollipop firmware G900FXXU1BNL9_G900FAUT1BNL2_G900FXXU1BNL9
should i go ahead?i know the risk is all mine.

Your in a custom recovery?
Send from my G900F @ Ressurection Remix using Tapatalk.

sp3d00 said:
Your in a custom recovery?
Send from my G900F @ Ressurection Remix using Tapatalk.
Click to expand...
Click to collapse
Yes safstrape dual recovery.
should i remove it before flashing?

raisqureshi said:
Yes safstrape dual recovery.
should i remove it before flashing?
Click to expand...
Click to collapse
I dont know!
I never did this with my S5. But I think the only think that could happen is, that the recovery will be overwritten when it's updated.
How can u are knoxed 0x0 with a custom recovery?

sp3d00 said:
I dont know!
I never did this with my S5. But I think the only think that could happen is, that the recovery will be overwritten when it's updated.
How can u are knoxed 0x0 with a custom recovery?
Click to expand...
Click to collapse
click on following link to understand everything,
https://www.google.co.in/url?sa=t&r...M8PgLBuEfsSBc-LIkvk9H7Q&bvm=bv.89217033,d.c2E

Not a cool thing! Cause it cant write into recovery, kernel and CSC partitions. You need compatible Roms for this. I dont like it.
I think u can do your flash.
Send from my G900F @ Ressurection Remix using Tapatalk.

No os installed - Note 4 - SM-910C

Basically I wiped EVERYTHING from the phone with TWPR (didn't mean to, kind of foolish I know). So basically I can not do anything but go in to download mode. How do I fix this?

If you mean that you need a new Firmware right now for your device, You can find it on here . Just enter your device model (n910f, n910c , etc) Then flash it using odin .. blah blah blah
Thanks !

You don't have to install stock rom all you need is external sd card which contains custom rom to install that's it

TheWeirdGrizzly said:
Basically I wiped EVERYTHING from the phone with TWPR (didn't mean to, kind of foolish I know). So basically I can not do anything but go in to download mode. How do I fix this?
Click to expand...
Click to collapse
Download eRobot ROM from here, read the instructions - How to install.
copy the files in your SD card and install eRobot ROM. It is very easy to install and excellent performance.

Flashing custom roms need a custom recovery which the OP doesn't have right now if i understand him correctly.
The correct step right now is to flash the official stock rom in download mode via odin.

GrippingSphere said:
Flashing custom roms need a custom recovery which the OP doesn't have right now if i understand him correctly.
The correct step right now is to flash the official stock rom in download mode via odin.
Click to expand...
Click to collapse
Downloaded the official firmware and installed it via odin, works like a charm. Thank you
(already had the firmware on my pc, thus why it didn't take long xD)

RECOVERY IS NOT SEANDROID ENFORCING and green RESET in ODIN after 2nd flashing

Hi everybody.
I have a Samsung Galaxy A5 (6) 2016 (SM-A510F) with android 6.0.1.
I tried to root with CF-Auto Root and did everything as supposed to. But when the phone reboot it says always recovery is not seandroid enforcing.
So I did the same procedure again with the ODIN always and I unchecked the AUTO Reboot. But now ODIN says with green letters RESET. Did i just reset my phone?
I flashed the same file. I followed the procedure to the letter as said in the CF-AutoRoot thread. But I can;t understand whats wrong. I always use to root my phones but was Sony not Samsung. :crying:
What can I do?
The phone now suppose to be 6.0.1 or 5 android version? If it reseted it fully i mean.
Plus my knox warranty void number is 1. So that means that the first time worked but i didnt know what to do after that message.
Is the Ashyx method [TWRP 3.0.2-1][ROOT] GALAXY A5(2016) - sm-a510 - UPDATE 5/4/2016 capable of rooting my phone now? Or i have to put the stock rom inside and after try to root?
Save me please! I hope i didnt brick it.
Thanks a lot guys. I hope for a quick response! xx

Odin repack install
CF-AutoRoot making installation because brick device.
install twrp
https://download.chainfire.eu/1001/SuperSU/UPDATE-SuperSU-v2.78-20160905010000.zip download supersu stable flash it
sorry google translate

Recovery is not seandroid enforcing
Dreamer62 said:
Odin repack install
CF-AutoRoot making installation because brick device.
install twrp
https://download.chainfire.eu/1001/SuperSU/UPDATE-SuperSU-v2.78-20160905010000.zip download supersu stable flash it
sorry google translate
Click to expand...
Click to collapse
hI
I HAVE THE SAME PROBLEM OM A7-2016 SM-A710M but also fail with twrp

Samsung galaxy a5 2016 SM-A10F
''Recovery is not Seandroid Enforcing. yep i ****ed up. Really need some help
i have Odin, i understand i need to flash it? with what file?:crying:
EDIT:A510F

First U should enable developer option and then oem unlocking enabled. Then flash cf auto root then it will boot otherwise install stock recovery then do the above it will work.
Sent from my SM-J700F using XDA-Developers mobile app

Dreamer62 said:
Odin repack install
CF-AutoRoot making installation because brick device.
install twrp
https://download.chainfire.eu/1001/SuperSU/UPDATE-SuperSU-v2.78-20160905010000.zip download supersu stable flash it
sorry google translate
Click to expand...
Click to collapse
If your device is bricked and not getting it back with Odin, try out the smart switch from samsung, there youll have EMERGENCY RECUPERATION, which leaves your device as it was.

ElCros said:
If your device is bricked and not getting it back with Odin, try out the smart switch from samsung, there youll have EMERGENCY RECUPERATION, which leaves your device as it was.
Click to expand...
Click to collapse
The smart Switch requires the S/N but I don't have it anymore! Is there any way I can find it?

Installing TWRP on Galaxy S4 GT-I9515 (Value Edition)

Hello everyone,
I was thinking about installing Lineage OS on my Samsung Galaxy S4 GT-I9515 (Value Edition) currently running Stock Android Version 5.0.1 without root.
Is the version of Lineage OS and TWRP I found at https://forum.xda-developers.com/galaxy-s4/i9505-develop/rom-cm14-1-galaxy-s4-jfvelte-gt-i9515-t3534552 appropriate for that purpose?
Now, my confusion arises from the fact that different guides seem to give incomplete or even contradictory instructions on how to approach that. As a first step, I need to install a custom recovery, such as TWRP:
Does this require my device to be rooted?
Some guides apparently require my bootloader to be unlocked; Is this necessary? If so, how do I do that?
Other guides suggest that I use Odin. Is this the correct approach? Does my bootloader need to be unlocked for that method? Is a root required?
Anything else I should pay attention to?
Thank you very much in advance

You need to find a guide for your phone
Different phones have different processes
For example Motorola phones require you to unlock the bootloader where as Samsung phones Iv worked with you don't
Some devices you have to root first before you can flash twrp while others you flash twrp first then root
For most Samsung phones around the age of yours you can root using CF-Auto-Root
This is done via odin and all you do is put your phone in download mode load the img file into odin & flash
The same is true for flashing twrp
Here are the files for your phone
CF-Auto-Root
TWRP
Flash each image in odin

Not able to root S4 GT-I9515
TheFixItMan said:
You need to find a guide for your phone
Different phones have different processes
For example Motorola phones require you to unlock the bootloader where as Samsung phones Iv worked with you don't
Some devices you have to root first before you can flash twrp while others you flash twrp first then root
For most Samsung phones around the age of yours you can root using CF-Auto-Root
This is done via odin and all you do is put your phone in download mode load the img file into odin & flash
The same is true for flashing twrp
Here are the files for your phone
CF-Auto-Root
TWRP
Flash each image in odin
Click to expand...
Click to collapse
I tried to flash CF-Auto-Root on my phone after completing the flash till reset on odin phone gets restarted and is showing following messages on top left corner on the samsung s4 logo screen
recovery booting....
RECOVERY IS NOT SEANDROID ENFORCING
Set Warranty Bit: recovery
it is not going any further than this please help.

TheFixItMan said:
You need to find a guide for your phone
Different phones have different processes
For example Motorola phones require you to unlock the bootloader where as Samsung phones Iv worked with you don't
Some devices you have to root first before you can flash twrp while others you flash twrp first then root
For most Samsung phones around the age of yours you can root using CF-Auto-Root
This is done via odin and all you do is put your phone in download mode load the img file into odin & flash
The same is true for flashing twrp
Here are the files for your phone
CF-Auto-Root
TWRP
Flash each image in odin
Click to expand...
Click to collapse
the twrp file bricks the phone

raffux3 said:
the twrp file bricks the phone
Click to expand...
Click to collapse
What do you mean by brick?
Does the twrp boot?
You must boot twrp straight after it's flashed - if you don't and your phone starts to boot you need to reflash it (once booted to twrp for the first time the recovery will stick)
Also if you swipe to allow modifications in twrp your rom may not boot unless you disable dm-verity - this can be done with a root zip eg CF-Auto-Root or magisk
Remember you may need to do other steps like enabling adb debugging & oem unlock before using CF-Auto-Root
You also may need to root before flashing twrp
That is the twrp for the S4 GT-I9515 - if you have a different variant it will not work
If you have a different model of S4 check the twrp website to see if there is an official version
I don't own your device - I'm sure there's guides that will you step by step process if you Google

TheFixItMan said:
What do you mean by brick?
Does the twrp boot?
You must boot twrp straight after it's flashed - if you don't and your phone starts to boot you need to reflash it (once booted to twrp for the first time the recovery will stick)
Also if you swipe to allow modifications in twrp your rom may not boot unless you disable dm-verity - this can be done with a root zip eg CF-Auto-Root or magisk
Remember you may need to do other steps like enabling adb debugging & oem unlock before using CF-Auto-Root
You also may need to root before flashing twrp
That is the twrp for the S4 GT-I9515 - if you have a different variant it will not work
If you have a different model of S4 check the twrp website to see if there is an official version
I don't own your device - I'm sure there's guides that will you step by step process if you Google
Click to expand...
Click to collapse
when you install it with odin, it starts for some seconds and stops with a FAIL. So the smartphone become bricked!!! I have the same model of s4 (I9515)

raffux3 said:
when you install it with odin, it starts for some seconds and stops with a FAIL. So the smartphone become bricked!!! I have the same model of s4 (I9515)
Click to expand...
Click to collapse
Flashing a recovery should not brick your device - you are just replacing stock recovery with a custom one - your phone should boot regardless but anyway
I assume you have enabled USB debugging - enabled oem unlock (if it's on your device) and flashed CF-Auto-Root first
I also assume you are flashing the tar image in the AP section of odin (you may need to Unzip to get filename.tar)
If you have done all the above search Google for a step by step guide for your device
Since I don't own this device I can't offer anymore support than that

TheFixItMan said:
Flashing a recovery should not brick your device - you are just replacing stock recovery with a custom one - your phone should boot regardless but anyway
I assume you have enabled USB debugging - enabled oem unlock (if it's on your device) and flashed CF-Auto-Root first
I also assume you are flashing the tar image in the AP section of odin (you may need to Unzip to get filename.tar)
If you have done all the above search Google for a step by step guide for your device
Since I don't own this device I can't offer anymore support than that
Click to expand...
Click to collapse
of course. i have installed root before and after I tried to install twrp recovery but it failed. Now I don't know how I can do to restore my s4. :crying:
I'm trying all prcedures for install the original firmware but odin fails always

raffux3 said:
of course. i have installed root before and after I tried to install twrp recovery but it failed. Now I don't know how I can do to restore my s4. :crying:
I'm trying all prcedures for install the original firmware but odin fails always
Click to expand...
Click to collapse
Long as it's the correct firmware for the device no reason why it wouldn't flash
Check download mode & make sure that the model number matches the firmware
If the firmware is also failing to flash I would guess there is a problem with your setup rather than the files (assuming the files are correct)

TheFixItMan said:
Long as it's the correct firmware for the device no reason why it wouldn't flash
Check download mode & make sure that the model number matches the firmware
If the firmware is also failing to flash I would guess there is a problem with your setup rather than the files (assuming the files are correct)
Click to expand...
Click to collapse
I have re-installed the usb drivers and odin works fine finally. I will try to root and install twrp again...thank you for support

Help recovering data

So I have a friend who decided to mess with his phone, of course without doing a backup, and now he's stuck in a situation that it can't boot even into recovery.
Currently all I see when booting to recovery:
Recovery Booting. . . . .
Set Warranty Bit : recovery
The phone is G900F
He has no idea what version was installed on it before.
I don't need the phone to boot, I need to recover the files on it.
Being a oneplus person myself, I'm not that familiar with samsung phones (my latest samsung was s2).
I've tried to install with odin (3.0.7 - if that matters) the following recoveries:
official twrp 2.8.7
twrp
cwm
All these recoveries showed "Recovery is not seandroid enforcing" message as well as the above when trying to boot into recoveries.
I've tried the official recovery as well:
https://forum.xda-developers.com/galaxy-s5/general/sm-g900f-stock-recovery-5-0-lollipop-t3228871
which removed the "seandroid" message, but that's all.
Not sure what I'm missing.
Any help would be appreciated!

Tahvok said:
So I have a friend who decided to mess with his phone, of course without doing a backup, and now he's stuck in a situation that it can't boot even into recovery.
Currently all I see when booting to recovery:
Recovery Booting. . . . .
Set Warranty Bit : recovery
The phone is G900F
He has no idea what version was installed on it before.
I don't need the phone to boot, I need to recover the files on it.
Being a oneplus person myself, I'm not that familiar with samsung phones (my latest samsung was s2).
I've tried to install with odin (3.0.7 - if that matters) the following recoveries:
official twrp 2.8.7
twrp
cwm
All these recoveries showed "Recovery is not seandroid enforcing" message as well as the above when trying to boot into recoveries.
I've tried the official recovery as well:
https://forum.xda-developers.com/galaxy-s5/general/sm-g900f-stock-recovery-5-0-lollipop-t3228871
which removed the "seandroid" message, but that's all.
Not sure what I'm missing.
Any help would be appreciated!
Click to expand...
Click to collapse
Hmm...
I see that your friend messed up his phone very well .....
Hopefully the eMMC memory is not corrupted becuase then only motherboard replacement would be necessary.
Summarising what you wrote:
1. you flashed "official recovery 2.8.7" -> where did you get it from? 2.8.7 is the very old version!
2. you flashed unofficial TWRP very old (2014) recovery (I checked your link)
3. you flashed unofficial CWM very old (2014) recovery (I checked your link)
4. finally you flashed stock, from old OS 5.0 Lollipop recovery provided from entrusted source - nobody reported that it works in the thread.
I listed this for you in order to underline one thing - READ, READ, READ, ASK, ASK, ASK .... before flashing anything to the phone and tell it to your friend.
Le's start with flashing from ODIN ver 3.12.7 (I am using it) this version of TWRP:
twrp-3.1.1-0-klte.img.tar for G900F which is the latest official recovery:
https://twrp.me/samsung/samsunggalaxys5qualcomm.html
Read how to flash it with odin method (when you open the link).
Edit: Are you sure the phone is SM-G900F? Please check model number on the label under battery (inside the phone).
Edit2: When you enter odin mode check phone model version as well - it is provided by installed bootloader.

Many40 said:
Hmm...
I see that your friend messed up his phone very well .....
Hopefully the eMMC memory is not corrupted becuase then only motherboard replacement would be necessary.
Summarising what you wrote:
1. you flashed "official recovery 2.8.7" -> where did you get it from? 2.8.7 is the very old version!
2. you flashed unofficial TWRP very old (2014) recovery (I checked your link)
3. you flashed unofficial CWM very old (2014) recovery (I checked your link)
4. finally you flashed stock, from old OS 5.0 Lollipop recovery provided from entrusted source - nobody reported that it works in the thread.
I listed this for you in order to underline one thing - READ, READ, READ, ASK, ASK, ASK .... before flashing anything to the phone and tell it to your friend.
Le's start with flashing from ODIN ver 3.12.7 (I am using it) this version of TWRP:
twrp-3.1.1-0-klte.img.tar for G900F which is the latest official recovery:
https://twrp.me/samsung/samsunggalaxys5qualcomm.html
Read how to flash it with odin method (when you open the link).
Edit: Are you sure the phone is SM-G900F? Please check model number on the label under battery (inside the phone).
Edit2: When you enter odin mode check phone model version as well - it is provided by installed bootloader.
Click to expand...
Click to collapse
First, thank you for trying to help me!
Please see attachments:
https://drive.google.com/folderview?id=1euC7-CoBeeUQxTGXQnPPgRE2-5VxFXLh
You can see that it is indeed g900f. I've also checked under the battery.
I've flashed the recovery you asked, however I could not find odin 3.12.7 only 3.12.10, so I've flashed with that (the odin thread on xda does not provide a link for 3.12.7 download).
You can see that it's still not booting with that recovery, it's just stuck at "booting recovery" screen.
I'm thinking perhaps it has a bad bootloader? How would you suggest to proceed?

Tahvok said:
First, thank you for trying to help me!
Please see attachments:
https://drive.google.com/folderview?id=1euC7-CoBeeUQxTGXQnPPgRE2-5VxFXLh
You can see that it is indeed g900f. I've also checked under the battery.
I've flashed the recovery you asked, however I could not find odin 3.12.7 only 3.12.10, so I've flashed with that (the odin thread on xda does not provide a link for 3.12.7 download).
You can see that it's still not booting with that recovery, it's just stuck at "booting recovery" screen.
I'm thinking perhaps it has a bad bootloader? How would you suggest to proceed?
Click to expand...
Click to collapse
Ok. Let's continue ... I hope (as I had very similar situation) that the phone is not hardbricked and eMMC memory is not corrupted -> I faced this on my phone and finally had to replace motherboard.
But let's be optimistic:
1. For data recovery - I don't have a silver bullet for this but I found this software: http://www.recover-android-iphone.com/recover-android/how-to-recover-data-bricked-samsung.html
It needs working odin mode so under condition that it supports s5 G900F it should be able to restore some data.
2. For unbricking - I recommend to flash via odin the latest official Samsung stock firmware dedicated to your friend's country/region:
https://www.sammobile.com/firmwares/galaxy-s5/SM-G900F/
You must be registered to download the software. Link for odin 3.12.7 is available on the bottom of the download page.
Just to underline - odin flash most probably (anybody please confirm that) will wipe your data so be aware of that.
Good luck.

Many40 said:
Ok. Let's continue ... I hope (as I had very similar situation) that the phone is not hardbricked and eMMC memory is not corrupted -> I faced this on my phone and finally had to replace motherboard.
But let's be optimistic:
1. For data recovery - I don't have a silver bullet for this but I found this software: http://www.recover-android-iphone.com/recover-android/how-to-recover-data-bricked-samsung.html
It needs working odin mode so under condition that it supports s5 G900F it should be able to restore some data.
2. For unbricking - I recommend to flash via odin the latest official Samsung stock firmware dedicated to your friend's country/region:
https://www.sammobile.com/firmwares/galaxy-s5/SM-G900F/
You must be registered to download the software. Link for odin 3.12.7 is available on the bottom of the download page.
Just to underline - odin flash most probably (anybody please confirm that) will wipe your data so be aware of that.
Good luck.
Click to expand...
Click to collapse
Why a full firmware is needed? Perhaps I can flash only the parts required to get into recovery? I count mount the phone from recovery, that's why it's my priority.
I would like to know also if odin will wipe everything if flashing a full firmware?

Tahvok said:
Why a full firmware is needed?
Click to expand...
Click to collapse
Because it is commonly recommended way to unbrick a phone.
Perhaps I can flash only the parts required to get into recovery?
Click to expand...
Click to collapse
Perhaps, yes. But:
1. I don't exactly know what restricts your recovery to run properly. Flashing separate recovery failed.
2. You, for example, could try flashing separately one of the latest bootloaders dedicated to G900F from BL section with odin but I doubt it would help.
I count mount the phone from recovery, that's why it's my priority.
I would like to know also if odin will wipe everything if flashing a full firmware?
Click to expand...
Click to collapse
As far as I know yes but I am not 100% sure because I didn't try that myself on s5.
I would appreciate if somebody else confirms that.

Many40 said:
2. You, for example, could try flashing separately one of the latest bootloaders dedicated to G900F from BL section with odin but I doubt it would help.
Click to expand...
Click to collapse
Can you suggest a bootloader for me? I would like to try that first.

Tahvok said:
Can you suggest a bootloader for me? I would like to try that first.
Click to expand...
Click to collapse
In my opinion, if odin mode works then bootloader should be OK. But as you wish -
tell me first what stock firmware will you later on trying to flash on your friends phone or in which country the phone will be operated.

Many40 said:
In my opinion, if odin mode works then bootloader should be OK. But as you wish -
tell me first what stock firmware will you later on trying to flash on your friends phone or in which country the phone will be operated.
Click to expand...
Click to collapse
Hong Kong

Tahvok said:
Hong Kong
Click to expand...
Click to collapse
Latest available Firmware version for Hong Kong is G900FZHS1CQD1 however I can't find a separate flashable bootloader for you.
Generaly, in my opinion you might try any of the latest bootloaders compatible with SM-G900F phone (here you can find a collection: https://forum.xda-developers.com/showpost.php?p=54094068&postcount=3, I am on G900FXXS1CQI4) but again:
1. I doubt it will help for entering recovery;
2. I still recommend to flash complete stock firmware to unbrick the phone.
However if you anyway decide to try with a bootloader, flash it with odin from BL section (untick auto reboot). Also turn off the phone before and after flashing and pull out battery for about 30 sec. It happens that bootloader doesn't flash properly at once even the odin says "PASS" so some people reported that they needed to repeat flashing a few times. I managed to flash bootloader at first time.

Unfortunateely the phone is not with me anymore, so I won't be able to continue testing. Thank you anyway for trying to help me! I really appreciate your help!