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Vietnam S6 soft-bricked upon flashing 5.1 update !

I am creating this thread on behalf of @k_kasadze, who was seeking help from me using pm.
It looks like he has soft-bricked his Galaxy S6, whose model no. he says is indeed G920F without any doubt, by flashing the 5.1 firmware. I find it strange, because he did get PASS message on Odin, as shown by the screenshot below.
{
"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"
}
Can anyone help? As far as I know, you cannot downgrade after flashing 5.1.1. And you can't install TWRP either. Please correct me if one can install TWRP, in that case, he could restore from TWRP. I think he can still boot into download mode.

Ask him, to boot into stock recovery and clear cache + factory reset

Use emergency software recovery in Samsung smartswitch

s6
djaidyc said:
Use emergency software recovery in Samsung smartswitch
Click to expand...
Click to collapse
When I'm connecting in download mode the smartswitch says that device not supported, samsung driver is installed
factory reset didn't help

What version of odin did you use? Its recommended to use the very lasted version. That made the difference for a guy in another topic

Bring the S6 back to Samsung for warranty repair.

s6
roydok said:
Bring the S6 back to Samsung for warranty repair.
Click to expand...
Click to collapse
I used 3.10.6 odin and I can't bring that in service center it's not on warranty. Is there any downgrade option? or anothe 5.1.1 tar to flash?

Are you sure it's a 920f? Mine was made in Vietnam and is a 920i
Sent from my SM-G920I using XDA Free mobile app

dbarrett480 said:
Are you sure it's a 920f? Mine was made in Vietnam and is a 920i
Sent from my SM-G920I using XDA Free mobile app
Click to expand...
Click to collapse
yes I'm sure, it is G920f on the back there is also written g920f also inside... I checked
also when I'm trying old odin to flash it fails and writes this, but 3.10.6 works great but cant boot up
<ID:0/005> NAND Write Start!!
<ID:0/005> Complete(Write) operation failed.
<OSM> All threads completed. (succeed 0 / failed 1)

dbarrett480 said:
Are you sure it's a 920f? Mine was made in Vietnam and is a 920i
Sent from my SM-G920I using XDA Free mobile app
Click to expand...
Click to collapse
Made in is different than region specific devices. Vietnam is G920F only.

venki5star said:
Made in is different than region specific devices. Vietnam is G920F only.
Click to expand...
Click to collapse
Mind = blown lol
Sent from my SM-G920I using XDA Free mobile app

Try this French 5.1.1 SM-G920F S6 ROM from Sammobile:
http://www.sammobile.com/firmwares/download/48616/G920FXXU2BOFJ_G920FOXA2BOFJ_XEF/

s6
roydok said:
Try this French 5.1.1 SM-G920F S6 ROM from Sammobile:
http://www.sammobile.com/firmwares/download/48616/G920FXXU2BOFJ_G920FOXA2BOFJ_XEF/
Click to expand...
Click to collapse
After installation that rom you linked me did this bootloop anyone knows when will be other region 5.1.1 roms available approximately? will it be during 1 week or so?
Before I installed france 5.1.1 I've installed this rom http://forum.xda-developers.com/galaxy-s6/development/vnrom-s6-g920fxxu1aocv-v1-0-aroma-t3088154

Try reflashing again.

roydok said:
Try reflashing again.
Click to expand...
Click to collapse
tried a lot of times but I think there is something not flashed correctly. But after finishing the process odin says 100% pass.

SOLVED - bootloop after installation france 5.1.1 on G920F
SO who has similar problem I fixed the problem this way.
1) flashed TWRP RECOVERY 2.8.7.1 via ODIN
2) downloaded custom rom XtreStoLite-2.0-Odex-Pure-ROM-Final-XXU2BOFJ
3) flashed it and my phone is alive plus root and TWRP recovery

I have no idea what to do...
So I'm in the same situation as you, I was doing all sorts of flashing and stuff but something went wrong along the way.
So I have the very latest twrp installed and I connected to my pc, yet I can't move files over for some reason.

codewield said:
So I'm in the same situation as you, I was doing all sorts of flashing and stuff but something went wrong along the way.
So I have the very latest twrp installed and I connected to my pc, yet I can't move files over for some reason.
Click to expand...
Click to collapse
you have to use OTG cable and flash the system via usb flash drive like external storage and that's it

Odin fail
k_kasadze said:
After installation that rom you linked me did this bootloop anyone knows when will be other region 5.1.1 roms available approximately? will it be during 1 week or so?
Before I installed france 5.1.1 I've installed this rom http://forum.xda-developers.com/galaxy-s6/development/vnrom-s6-g920fxxu1aocv-v1-0-aroma-t3088154
Click to expand...
Click to collapse
OK so I was on the unbranded S6 920F and as the signal was pretty bad thought I would try the H3G latest stock firmware .on Sammobile.
I am on 3 anyway so hoped that using that firmware the modem may have been better. I did the usual and it failed at the end of the cycle same as you.
Did that several times and tried with smart switch, wasted loads of time then tried the first one that was released for 5.1.1(France) and it passed and booted normally.
Not a clue what happened maybe the H3G Rom BOfj was a corrupted file, though very unusual from sammobile.
Edit.
Ironically the signal actually appears better on the france 5.1.1 than befor on AO3 5.02..will update after a few days

NBB823151 said:
OK so I was on the unbranded S6 920F and as the signal was pretty bad thought I would try the H3G latest stock firmware .on Sammobile.
I am on 3 anyway so hoped that using that firmware the modem may have been better. I did the usual and it failed at the end of the cycle same as you.
Did that several times and tried with smart switch, wasted loads of time then tried the first one that was released for 5.1.1(France) and it passed and booted normally.
Not a clue what happened maybe the H3G Rom BOfj was a corrupted file, though very unusual from sammobile.
Edit.
Ironically the signal actually appears better on the france 5.1.1 than befor on AO3 5.02..will update after a few days
Click to expand...
Click to collapse
Glad to hear another positive bit regarding this firmware on the network reception... I am only holding up from flashing it is root...don't want to trip knox

[HELP] Derped by new Z3 (or maybe it's SIM Locked)

I broke my Z3 and got a replacement a few days ago.
After I flashed pre-rooted 23.4.A.0.546, linked here, the he replacement shows the dreaded Invalid Card. Emergency calls only:
{
"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 never tested the device, I went directly for the root, ZX discovery and pre-rooted flash.
As quick explanation:
I got the device.
I never inserted a SIM, I immediately followed the instruction to root a Z3 with a locked BL:
- downgraded phone with D6603_23.0.A.2.93 ftf linked here.
- ran giofroot exploit. used v3.1. had to run it twice.
- mounted /system rw with ES Explorer.
- installed Z3 Dualrecovery for locked BL.
- then flashed 23.4.A.0.546 linked here.
Phone turned on without a hitch.
When I placed the SIM, I noticed the Invalid Card notice.
Tried (and failed) attempts:
Since then, I've rolled back to D6603_23.0.A.2.93.
Installed PC Companion (eeew) and done a system repair.
Downloaded the latest firmware from xperifirm for Telcel's branded ROM.
nothing. device still says Invalid Card.
a few screenshots that might help someone get a better understanding of what happened;
can anyone confirm if I have a SIM-locked device or if I flashed the wrong firmware?
How can I roll back? what measurements can I take to better understand the problem?

Hobbess2099 said:
I broke my Z3 and got a replacement a few days ago.
After I flashed pre-rooted 23.4.A.0.546, linked here, the he replacement shows the dreaded Invalid Card. Emergency calls only:
I never tested the device, I went directly for the root, ZX discovery and pre-rooted flash.
As quick explanation:
I got the device.
I never inserted a SIM, I immediately followed the instruction to root a Z3 with a locked BL:
- downgraded phone with D6603_23.0.A.2.93 ftf linked here.
- ran giofroot exploit. used v3.1. had to run it twice.
- mounted /system rw with ES Explorer.
- installed Z3 Dualrecovery for locked BL.
- then flashed 23.4.A.0.546 linked here.
Phone turned on without a hitch.
When I placed the SIM, I noticed the Invalid Card notice.
Tried (and failed) attempts:
Since then, I've rolled back to D6603_23.0.A.2.93.
Installed PC Companion (eeew) and done a system repair.
Downloaded the latest firmware from xperifirm for Telcel's branded ROM.
nothing. device still says Invalid Card.
a few screenshots that might help someone get a better understanding of what happened;
can anyone confirm if I have a SIM-locked device or if I flashed the wrong firmware?
How can I roll back? what measurements can I take to better understand the problem?
Click to expand...
Click to collapse
Maybe this is important; when I downgraded the first time, I checked the following exemptions:
- KERNEL
- FOTA
- BASEBAND

Hobbess2099 said:
Maybe this is important; when I downgraded the first time, I checked the following exemptions:
- KERNEL
- FOTA
- BASEBAND
Click to expand...
Click to collapse
You did it wrong. NEVER check to exclude FOTA BASEBAND AND KERNEL.
baseband is what controls the radio (network) and it is very important. Flash again properly and don't check anything in exclude, but ALL in WIPE. In downgrade you MUST wipe everything.
Sent from my D6603 using Tapatalk

Thanks.
Is there a way to know which carrier is locking the device? Besides trying Sims from each carrier, I mean.
Sent from my SGP611 using Tapatalk

Hobbes2099 said:
Thanks.
Is there a way to know which carrier is locking the device? Besides trying Sims from each carrier, I mean.
Sent from my SGP611 using Tapatalk
Click to expand...
Click to collapse
No, but it is not probable that it is simlocked. It is almost 100% because you have wrong Baseband / Firmware combination. The older firmware (downgraded) does not support newer baseband you left in the device unflashed.

so I tried two different flashes including FOTA, BB and Kernel;
- D6603_23.0.A.2.93 from the original OP.
- latest firmware from xperifirm for Telcel's branded ROM; 23.4.A.0.546
in both cases, i left the entire Exception section unticked.
in both cases, after initual bootup, I still get the "Invalid Card." warning.
I'd like to start discarding possibilities.
- can flashing affect SIM lock? either way, locking or unlocking devices? My understanding is that it shouldn't. Could someone please confirm?
- is there a way with which carrier the devices is locked? The screenshot shows a [X] on network lock with a 5.
is there a way to find out that does not involve getting SIMs from every carrier?

Hobbes2099 said:
so I tried two different flashes including FOTA, BB and Kernel;
- D6603_23.0.A.2.93 from the original OP.
- latest firmware from xperifirm for Telcel's branded ROM; 23.4.A.0.546
in both cases, i left the entire Exception section unticked.
in both cases, after initual bootup, I still get the "Invalid Card." warning.
I'd like to start discarding possibilities.
- can flashing affect SIM lock? either way, locking or unlocking devices? My understanding is that it shouldn't. Could someone please confirm?
- is there a way with which carrier the devices is locked? The screenshot shows a [X] on network lock with a 5.
is there a way to find out that does not involve getting SIMs from every carrier?
Click to expand...
Click to collapse
Flash only firmware from XperiFirm. Others of unknown origin can be provider specific. However, the SIM LOCK is firmware independent.
I omitted some of your pictures. The X mark on Network means that is IS provider LOCKED and you have 5 retries to enter unlock code.

Need help, no radio!

I am a pretty decent android er. But damn, I got in trouble with my unlocked s7, flashing the new superman 1.5. I used the att csc option in aroma, and I had no SIM service. Nor imei, I tried to go back to 1.4.1 with corresponding BL, nothing, so I odin'd a stock package, and I did take, but still, everything SIM related or 5 ghz WiFi is down, since I've already dl'ed and installed a stock package from sammobile, what else are my options? Thanks a lot for anyhelp, I read that w other guys had a similar issue until it was noted that the att and tmo cscs were incompatible.

This is similiar to the problem I had. The CSCs for ATT and TMB (possibly sprint and Verizon if they exist) are bad. They are designed for a qualcomm device. T-mobile also uses a custom ims profile for their wifi/volte that has not been ported in the S6 or Note5 to international models even though they share the same chipset. - this may be cause for a bounty.
What I did after having this issue was reinstall the rom after a wipe, choosing a non-US carrier (the default one, for instance). It worked fine afterwards.

rp3 said:
This is similiar to the problem I had. The CSCs for ATT and TMB (possibly sprint and Verizon if they exist) are bad. They are designed for a qualcomm device. T-mobile also uses a custom ims profile for their wifi/volte that has not been ported in the S6 or Note5 to international models even though they share the same chipset. - this may be cause for a bounty.
What I did after having this issue was reinstall the rom after a wipe, choosing a non-US carrier (the default one, for instance). It worked fine afterwards.
Click to expand...
Click to collapse
That was my first instinct but everything I flash doesn't help, reflashing 1.5 and choosing sweeden, Nordic or Australian is the same, same with 1.4.1, and I reflashed a sock OS via Odin and still nothing, and then I refreshed twrp and redid 1.5 and still! Which has me worried

Did you wipe first? Also, are you using a 930f or a 930FD. If FD, there could be other problems.

rp3 said:
Did you wipe first? Also, are you using a 930f or a 930FD. If FD, there could be other problems.
Click to expand...
Click to collapse
Yeah, i mean i have to do a wipe to go from encrypted to un encrypted, I also only have the single sim. But i mean anyways, i def am solid on flashings and full wipes and stuff, I mean doing a stock OS through odin would def fix this normally, I can figured what little poison this superman left behind that isnt getting reset after flashes and wipes

I'm having the same issue. I have the FD (SM-G930FZSUXSG) I'm trying to find a factory image but am having no luck so far. I'll be keeping an eye on this thread to see if you get it resolved.

zombicidal maniac said:
I'm having the same issue. I have the FD (SM-G930FZSUXSG) I'm trying to find a factory image but am having no luck so far. I'll be keeping an eye on this thread to see if you get it resolved.
Click to expand...
Click to collapse
doing a little more research, i wonder if i didnt lose my IMEI somehow, it looks like the same symptoms

All the different firmware I've been flashing lets it boot into android but the Baseband only shows unknown. I don't know for sure which one would be the correct version for the model I have
{
"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"
}
Edit- After more searching it seems my model is the United Arab Emirates model. Now I just have to figure out which firmware is the correct for that model and hope I can fix it with that but who knows.

zombicidal maniac said:
All the different firmware I've been flashing lets it boot into android but the Baseband only shows unknown. I don't know for sure which one would be the correct version for the model I have
Edit- After more searching it seems my model is the United Arab Emirates model. Now I just have to figure out which firmware is the correct for that model and hope I can fix it with that but who knows.
Click to expand...
Click to collapse
So you have the same issue?

Yes. Everything was good when I got the phone new but now I need to find the factory firmware but so far no luck.

Convert S6 duos SM-G9200 from CHC to TGY

Hello All,
I have S6 duos SM-G9200, its comes with andoid verion 6.1 Hong Kong TGY, all applications are works correctly same google application, but the big problem is the battery disharging very quick (7% per hour) even the mobile is in sleep mode.
when i flashe it with China verion CHC 6.1 the problem of battery is solved but google applications and some applications not works correctly.
I want to convert the firmware from android verion 7.0 china CHC (G9200ZCU2EQH1) to Hongkong TGY.
I have tried the TGY firmware G9200ZHU2EQJ1 and G9200ZHU2EQH2
Also i have tried flashing by 4 files but i doesnt work
{
"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"
}
in addition, unlock OEM option is not available, and i try with CR service CRROM, and it say that its unlocked but right now i cant flash the 4 file
may i flash my mobile by TGY version? Please help me

please, anybody can help me?

First of all, download your firmware from Sammobile or Updato.
Also Home_CSC flashes without wiping / factory resetting the phone. CSC wipes the phone / factory reset. Up to you which one you want to use.

benjamen50 said:
First of all, download your firmware from Sammobile or Updato.
Also Home_CSC flashes without wiping / factory resetting the phone. CSC wipes the phone / factory reset. Up to you which one you want to use.
Click to expand...
Click to collapse
Hi benjamen50,
I have downloaded TGY firmware from sammobile and from Updato application, also, i download the 4 files by usinf SamFirm application, but when i flash by Odin there is PIT file error, so i cant flash this mobile to TGY firmware.

I am wondering why set PIT fails, could perhaps be bad charger port, cable or usb port on computer?

room cook SM-G9200 duos sim China
forum.xda-developers.com/galaxy-s6/general/recovery-s6-duos-sim-sm-g9200-9208-9209-t3716760
CMW G9200 CHC: mediafire.com/file/e969yc13d46m5eu/G9200-PC1-TWRP-3.0-PC1.tar
Room cook androi 7.1 mod 8.1:

Battery Problem SM-G9200 CHC Android Version 5.0.1 Lollipop
Let me know if you solve your problem, i have same problem in my phone SM-G9200 CHC quick battery low even in sleep mood and screen is off.

riane said:
Hi benjamen50,
I have downloaded TGY firmware from sammobile and from Updato application, also, i download the 4 files by usinf SamFirm application, but when i flash by Odin there is PIT file error, so i cant flash this mobile to TGY firmware.
Click to expand...
Click to collapse
benjamen50 said:
I am wondering why set PIT fails, could perhaps be bad charger port, cable or usb port on computer?
Click to expand...
Click to collapse
My cable and my usb port are good
because when the flash of TGY PIT file is successful, but when i try to flsh the CHC PIT file, it appear on my mobile SECURE CHECK FAIL PIT

I dont know if my S6 duos SM-G9200 assigned to china or to Hong kong, how can I know that? i have a model number, serial number

please, anybody can help me?

riane said:
please, anybody can help me?
Click to expand...
Click to collapse
please, anybody can help me?

riane said:
please, anybody can help me?
Click to expand...
Click to collapse
Hi friend,
I have same problem with you on my S6 G9200 phone, but still not have any way to fix PIT FAIL ERROR, i flashed TGY Rom many times before.
And then I find this Rom, it's so good for me. Now i share it here, you can download and try to use if need.
Rom flash through Recovery: https://drive.google.com/file/d/1cKUkNQBb-sqqr0hmRj9NB7sGVePSjqWV/view?usp=sharing
Recovery: https://drive.google.com/file/d/0B3lKG69W6panSG1OLVpZTEpKYlE/view?usp=sharing
After flashed ROM, restart system all into Phone Screen. Run this CH Play apk file and your phone will have CH Play normally.
https://drive.google.com/file/d/0B3lKG69W6panYl9lTzZCZlY2Y3M/view?usp=sharing
Notice: Don't flash more anything.
Have fun

chauchibang said:
Hi friend,
I have same problem with you on my S6 G9200 phone, but still not have any way to fix PIT FAIL ERROR, i flashed TGY Rom many times before.
And then I find this Rom, it's so good for me. Now i share it here, you can download and try to use if need.
Rom flash through Recovery: https://drive.google.com/file/d/1cKUkNQBb-sqqr0hmRj9NB7sGVePSjqWV/view?usp=sharing
Recovery: https://drive.google.com/file/d/0B3lKG69W6panSG1OLVpZTEpKYlE/view?usp=sharing
After flashed ROM, restart system all into Phone Screen. Run this CH Play apk file and your phone will have CH Play normally.
https://drive.google.com/file/d/0B3lKG69W6panYl9lTzZCZlY2Y3M/view?usp=sharing
Notice: Don't flash more anything.
Have fun
Click to expand...
Click to collapse
Thanks chauchibang,
Is it a good ROM? are there any error messages? is google play stor installed on this ROM?

Ah…How do you flash CHC g9200 to TGY one？
They are even not a same modern
I can suggest you some great third-party TW-based roms made from Chinese devs as you can contact me by telegram
Just search @watsonpeanut

What stock firmware will work on this apparent refurb S7?

A friend's S7 is stuck on Android 7.0 but they brought it to me because their wife has the same phone but it upgraded to Android 8.0. Despite reboot, and factory data reset, when I press System update nothing happens, there is no UI response at all.
There has been some confusion over over which firmware to use as when I have provided screenshots as different people have told me because I am in Ireland I should use XEU, others have told me I should use INS or something else. The about device menu, the download firmware upload screen, the CSC dial code, and the Phone Info app all report the phone is a different model. Please see the different models and device information observed below.
SM-G930F observed:
{
"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"
}
Initially based on this with Odin I tried flasing https://samfw.com/firmware/SM-G930F/XEU/G930FXXU8ETI2 :
Looking at Odin it seemed to work, but I read on successful flash a new reset button should appear where the green pass box is displayed but at the end this just appeared for a split second before reverting to the green pass box, before the phone restarted itself. On checking nothing has changed, still Android 7.0, despite reboot, and trying to flash again.
On further investigation, apparently the CSC that's an Indian dual sim SM-G930FD:
But this is a single SIM model:
SM-G930P observed:
I tried the same firmware again, this time using the CSC file instead of CSC home:
Phone Info app screenshots, SM-G930V observed:
The main purpose of trying to upgrade is to enable the owner to link a heart rate monitor watch device to it with Bluetooth which required 8.0, as to alert them to any heart abnormalities. Due to this, I would rather not use any custom ROM and only stock.
Is there a stock version firmware that will work with this device, and are there any higher than normal risks involved with flashing it with Odin? It was mentioned to me that because the device is an apparent refurb the risks are 50/50, and I would rather make the owner aware of this before flashing if that is the case.

CPU-Z:

I might be able to help you,
Is the phone model SM-G930F or SM-G930/A/P/V/some other kind of USA variant?
Can you show a picture of the device in stock recovery mode as-well as a picture OEM unlock in the developer menu?
The phone seems to display multiple times, the Snapdragon variant of the S7.
The phone also seems to show the bootloader and the baseband/modem, as G930P, the Sprint version of the S7,
the build version/PDA, and the CSC shows G930V, meaning the Verizon version of the S7. These two models probably shows that the S7 used to be a Snapdragon S7, not the Exynos version (G930F)
You said the phone is a apparent refurb, right?
The only reason I could think of why Odin somehow flashed SM-G930F firmware is that it probably has some kind of USA/Snapdragon variant of the S7 logic board and has the rest of the part with the model SM-G930F.
Not sure yet, but you may want to try flashing a USA variant of the S7 firmware.
Alternativly, if it is overruled that the phone is not a Snapdragon S7, you may choose to use this custom ROM/firmware. Everything works as it is just regular stock ROM (android oreo 8).

Things you can try:
Flash the latest Nougat firmware, then flash Oreo.
Flash the firmware in separate (eg. Bootloader only, CP only, ...)
Flash the latest recovery (extract it from the firmware) and wipe the phone with it, then head to the updated Bootloader (that you flashed separately) and try flashing again.
Use custom stock ROMs, if all you need is just Samsung Health, otherwise, even AOSP ROMs can make the deal.
Flash an earlier version of Oreo.
It doesn't matter a lot if the phone is refurbished or not, you only write to the motherboard, so knowing what chip and model your motherboard have is the only pillar you need.