"No signal" on G955W/U - what options ? - Samsung Galaxy S8+ Questions & Answers

Hello everyone,
So I have been using my canadian G955W (Rogers, but I've been using it in France, if that matters) for a couple of years now, until I got an OTA September 2020, which apparently bricked the modem as described in this thread .
Back then I didn't have time to try any fixes, apart from factory reset, but it still didn't work. Weirdly, a couple of weeks later (late November), when I tried to put back my SIM it worked fine again.
Then I kinda forgot about it and got a new OTA in January 2021 and had the bad idea to update it - so again the same problem : no signal.
So I tried to flash an older version and also the newest version of the firmware (as suggested in the thread above), using Odin v3.13.1 but wasn't able to install anything older than G955WVLU8CTF3 (August 2020), probably because of the bootloader version (?), and still no signal.
I also tried to flash a US version of the firmware (latest one G955USQS8DTJ1), so now I have a G955U, but still no signal.
I'm kindof a noob in all this (sorry for that), but still would like to fix my phone, as the rest is working really fine.
Would you have any advice on what I could do next to find a workaround ?
- I've been willing to root my phone, so should I try this method which also will go to V7 bootloader ? https://forum.xda-developers.com/t/...e-snapdragon-g955u-u1-v8-bootloaders.4128321/
But I'm kind of hesitant, since there's quite a risk of bricking my phone completely..
- Is there another way to go back to an older firmware version ?
- Also what version of Odin works best for the G955W/U ? I have the feeling that v3.13.1 fails quite often with my device.
Thanks a lot for any help !

Related

How to downgrade?

I did the biggest mistake of updating my awesome S7 to the April update patch & now the Android System bug has hit my phone & nothing seems to work for me. Even formatting the phone is not working for me. Please can someone guide me on how to revert back to the March Firmware or is that even possible with samsung phones? This is my first samsung phone.
Have you tried flashing the current firmware using Odin? You should do a factory reset and then flash via Odin and snag your firmware from here. Make sure you get YOUR firmware, since there are quite a few different S7's running out in the wild!
http://www.sammobile.com/firmwares/download/69006/G930FXXU1APD1_G930FDBT1APC5_DBT/
Here is also a nice guide how to flash manually
http://forum.xda-developers.com/galaxy-s7/how-to/rom-stock-firmware-samsung-galaxy-s7-sm-t3335705
Yep, android system bug after the April update.
I have given my device to samsung gallery let's see what do they have to say about it..Will get it on 18th of April. Will update this post.Thanks for the reply.
Is it possible to go back to the March update firmware? The link you have given is for Germany, I am from India which is not in the list any help on that? Thanks for the reply.

Putting firmware from a different country on my phone (PIT doesn't match)?

Dear Android Brothers and sisters,
I am wanting to update the firmware on my S6 (downloaded from SAMmobile) but am in an odd position...
My S6 main board failed (unable to see mobile networks), and after trying everything in the known universe to fix this, concluded it was hardware and purchased a second hand main board off eBay, that I've now fitted. It was working OK, but is from France (I am in England).
It worked OK but had an ancient stock ROM. The first thing I wanted to do was install Lineage, however there didn't seem any option to allow for the bootloader to be unlocked to allow me to flash the TWRP recovery. After much 'jiggary pokery', I downloaded the English firmware from SAMmobile, extracted all of the binaries and tried to flash them individually using Heimdall (I run Linux not Windows). Whilst this worked for some, there appeared to be a mismach in the partitions that were expected - I guess this is something to do with the France firmware being structured differently? So after a bit of soft-bricking, I managed to get Lineage on the phone, which is mostly working, but behaving somewhat strangely. At the end of the day, I want the latest firmware (radio etc.) and to have Lineage working OK.
Is it possible for me to somehow flash the English firmware on this French board (including the PIT which I assume relates to the partition structure which will allow it all to work)? Any ideas how I'd do this? If I'd have to use Odin, so be it, I'll do it work on my windows box, but ultimately I would like someone to confirm I can do this without bricking my phone. I've read around and people seem to suggest it would be OK but I don't know the best way to do this. I assume the best way to get to my stable end, would be to flash the latest English firmware from SAMmobile, unlock the bootloader, flash TWRP then install Lineage in the 'normal' way?
Any thoughts or suggestions (including pointers to other posts I may have missed) really gratefully received !
Cheers,
Neon

US Galaxy S8+ OTA software update not working / alternative way. SOLVED

What I want to do: I was trying to OTA update my phone software to the latest, but it seems I am behind on many updates. On the AT&T website, I saw that I need the previous updates installed first, in order to get the latest ones. I have to go in order.
Problem: Everytime I try to do a software update from the settings, it says “Current software is up to date.” It’s been saying that for over a year now. I can’t even get the updates from last year.
So is there a way I can flash one of the stock firmware updates from last year on to my phone with Odin and see if it will fix the ‘over the air’ updates? Or can I just skip to the most recent firmware and flash that one.
By the way, I have never done anything like this to my phone before, so I am a bit nervous, but I want to get this problem fixed so I would love if someone helped me out. I did see some articles online about flashing stock firmwares, that’s how I learned about Odin.
If this is doable, can someone please link me to a thorough tutorial on this process? If it isn’t, can you guys recommend another way of getting to the latest 8.0 stock firmware?
My phone right now:
Galaxy S8 plus (AT&T)
Model#: SM-G955U
Android version: 7.0
Baseband version: G955USQS1AQF7
Android security patch level: June 1, 2017
Kernel version: 4.4.16-11449429
Zendrop said:
What I want to do: I was trying to OTA update my phone software to the latest, but it seems I am behind on many updates. On the AT&T website, I saw that I need the previous updates installed first, in order to get the latest ones. I have to go in order.
Problem: Everytime I try to do a software update from the settings, it says “Current software is up to date.” It’s been saying that for over a year now. I can’t even get the updates from last year.
So is there a way I can flash one of the stock firmware updates from last year on to my phone with Odin and see if it will fix the ‘over the air’ updates? Or can I just skip to the most recent firmware and flash that one.
By the way, I have never done anything like this to my phone before, so I am a bit nervous, but I want to get this problem fixed so I would love if someone helped me out. I did see some articles online about flashing stock firmwares, that’s how I learned about Odin.
If this is doable, can someone please link me to a thorough tutorial on this process? If it isn’t, can you guys recommend another way of getting to the latest 8.0 stock firmware?
My phone right now:
Galaxy S8 plus (AT&T)
Model#: SM-G955U
Android version: 7.0
Baseband version: G955USQS1AQF7
Android security patch level: June 1, 2017
Kernel version: 4.4.16-11449429
Click to expand...
Click to collapse
If you are using the AT&T S8+ outside of the USA, you will not get any OTA updates due to AT&T update policy. What you want to do is flash the Unlocked firmware and you will be good. Search for carrier switching thread and follow it.
aromerblz said:
If you are using the AT&T S8+ outside of the USA, you will not get any OTA updates due to AT&T update policy. What you want to do is flash the Unlocked firmware and you will be good. Search for carrier switching thread and follow it.
Click to expand...
Click to collapse
Thanks for responding!
I managed to flash an older firmware from 4 months ago and I was able to OTA update to the recent one. https://forum.xda-developers.com/at...lternative-t3844887/post77673505#post77673505
Software update for s8+
Please where can I get latest software update for Samsung galaxy s8+ model number SM-G955U

[RESOLVED] Updating to Pie

Ok. I got an AT&T Galaxy Note 8 back in early-mid 2018. The first thing that happened when I booted it up and connected to a wifi hotspot was that it downloaded the latest update.
That was the last update I received.
I am trying to install Android P onto my device through Odin (Using 3.13.1B PatcheD). I tried OTA first, but when checking for updates, it says that my phone is up to date. I am currently on build U4CRD7.
I called AT&T and they told me that I have to contact Samsung to download the update, and also that it could be a hardware issue (?) and to possibly send it in to Asurion. After that, I called Samsung, and they told me I had to take it to the closest Best Buy. Now, I don't have a way to travel the ~30 miles to the closest one. So, I decided to try Odin. (I have used Odin before, so I am somewhat familiar with it)
I downloaded firmware version U7DTC1_USC from a post here on the forums. I placed all files in the correct areas, went to download mode, tried flashing, and failed. I've gotten three different fails. I changed cables and ports and failed. I tried downloading firmware version U7DSK3 and flashing that one, thinking I might have skipped too many updates (if that is a thing... I've read conflicting information). Failed.
The last failure was a "Complete(Write) operation failed"
Besides taking an expensive rideshare to the nearest Best Buy, is there something that I am missing in trying to update this phone? Could it be a hardware issue? Have I missed too many updates? Do I need to progressively update my phone? (I don't need answers to all these questions, just the most relevant answer please)
If I have posted this in the wrong area, I am sorry. This is my first post on XDA, and I usually don't post in forums anywhere, I just lurk and look for answers to my questions. I haven't been able to find a matching problem.
Edit:
More digging and I found this in another thread.
MrMike2182 said:
...You need to manually update it yourself to the next update version which I think is ... using Odin and then it'll be able to do it on it's own.
Click to expand...
Click to collapse
In further replies, he suggests updating to the firmware version that I am currently at. What is an "update version?" Do I need to just go one firmware update up? Do I need to go one BL version up?
Phone successfully updated
So, I downloaded firmware version U5DSC1, dug up my 10 year old laptop and switched from the patched version to the normal Odin3 3.13.1.
I don't know which change allowed the update, but I was able to update.
After U5DSC1, I had no problem updating to U7DTC1 through Odin (though the system update feature on the phone still did not pick up any updates after U5DSC1).
G-Man Cometh said:
So, I downloaded firmware version U5DSC1, dug up my 10 year old laptop and switched from the patched version to the normal Odin3 3.13.1.
I don't know which change allowed the update, but I was able to update.
After U5DSC1, I had no problem updating to U7DTC1 through Odin (though the system update feature on the phone still did not pick up any updates after U5DSC1).
Click to expand...
Click to collapse
Your problem was simply because you were trying to use the patched version of Odin and should have just used the newest updated version of Odin. There's no reason to use the patched Odin to flash the normal firmware. People use the patched Odin when they're flashing modified firmware.
Edit: By the way, if it's an AT&T device and you're using say a T-Mobile or Verizon sim card it will not update unless you put an AT&T sim card back in it. It's apparently picky like that. For instance let's say it had AT&T firmware on it and you have a Verizon(or other) sim card in it, the phone is expecting to find and download the AT&T firmware for updates the problem is that Verizon(and others) do not carry AT&Ts firmware they only have their own versions of firmware that's the reason some people don't get updates.

Installing ROM and Changing Firmware

Good evening ladies and gents,
I got a phone today from Amazon Galaxy Note 10 Plus. SM-N975F/DS.
Got it activated on AT&T which took a bit of trickery but finally got it activated.
So now I am in the process of rooting it and noticed that there are many region specific firmware (you have to use Magisk to patch the firmware (the .md5)). For example mine is N975FXXU6FUCD-MID which was difficult to find and difficult to identify. I have located this (MID) region and its Iraq. As I type this that exact firmware is downloading from SMAMOBILE. I will be flashing a custom ROM within the next few hours. I was wondering tho, since there is no USA Firmware version, will the custom ROM change the firmware thus rendering this entire post irrelevant? Does the firmware matter if the phone is activated and functioning, or is there anything else anyone would suggest? For example should I flash a firmware from perhaps Mexico since its the same continent?
I ask because as I stated above, I am downloading the N975FXXU6FUCD-MID firmware now, and I have to use Magisk to patch the firmware so I just figured I would patch the exact same firmware that is on the phone currently but should i patch a different firmware instead?
Anyway, If anyone has any insight into this I'd love to hear it. Thank you!

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