i9505 no network service at all (only emergency calls) - any ideas? - Galaxy S 4 Q&A, Help & Troubleshooting

Hey there!
I try to keep it short. I have no network service (the sim is working in other phones). There is sometimes a "stop" like symbol in the top bar or an exclamation mark saying "no chosen network available". However, emergency calls should be possible (phone got network access).
I bought the phone, so it's used and that "problem" was known. I thought I could fix it. I tried the following:
Rooting and RegionLockAway.
Flashing new Firmware (I9505XXUHOA7)
Flashing the ME2 modem and trying to SIM-Unlock it. However I get an popup "error" after pressing NV-Rebuild (it stated Golden Backup exists) and then the phone immediately reboots.
SIM detection seems to work (asks for PIN and notifies on empty sim)
The IMEI is there.
If I try to choose networks it gets a list with EPlus, T-Mobile and Vodafone (I am currently in Germany). Unfortunately I do not know where the phone's from.
Also, I never experienced any popups asking for unlock codes or similar - it is just not able to register on the network.
How can I make sure theres no SIM Lock?
How can I make sure theres no Netlock?
After those two are clear what else could be done? What about NVData?
Anyone any ideas? Thanks!
I can post some infos from the service/UMTS menu, however I am not sure which. I also searched and tried hours but without success.

Replace the SIM card tray. From appearances yours is dying.

Thanks for the reply. Can I test this somehow? I am just wondering since it asks for SIM-PIN and even reads APN data etc. I just searched and it is about 10 bucks on ebay and I should be able to do it at home that would be cool. So since it is detecting my SIM can I test somehow whether there could be other problems causing this problem bevore I try to replace that sim-slot?
Thank you!
By the way: Yesterday I also tried to repair NVData with the SamsungUnlock software as posted somewhere here. While that worked without a problem it did not change anything.

To sim unlock the phone, you could try flashing the 4.2.2 modem, rooting, and using regionlockaway.

fassal said:
Can I test this somehow?
Click to expand...
Click to collapse
I wish there was a way to test it. I only knew mine was bad by sheer luck. Mine revealed itself only after flashing an Android 4.2.2 stock ROM; more current versions didn't show anything.

Could there be a loose connection inside the phone?

Where it is a known issue, there is a possibility that the original owner replaced the SIM tray. When they did, they likely forgot to reuse the foam pad from the top of the connector on the old tray. If that pad is missing the connector will pop up in time.

hey thanks for your help!
I will open the phone and check the connector of the SIM-Tray. But as I already described, it even asks me for the SIM-Pin, but maybe even though something might not be right.
Regarding flashing an 4.4.2 Modem: Is that the "9505_DXUAME2_MODEM.rar"? If, I tried that already (installed that modem, rooted, RegionLockAway and even with the Serive Menu SHA256 OFF method (this one did not work since I got an Error and the phone did not freeze etc.). However, I did not install a full 4.4.2. Stock Rom yet.
Well maybe I could buy a SIM Tray and just connect the PIN without acutally gluing it on the phone. This way I might be able to get a refund if this does not do the trick.
If all these fail I just have to find some new use for that phone

You cannot use an Android 4.4.2 modem or ROM to unlock. The modem or ROM MUST be from Android 4.2.2 or RegionLock Away will not work.
Regarding the SIM tray, foam mounting tape from the local store on top of the connector will work. No need of glue.

Related

Not Registered on Network

Hi guys,
I recently picked up a used S4 on Craigslist for cheap because the guy "screwed up" using Odin and flashed something that caused his phone to not register on any networks. I figured, what the hell, it's cheap enough and I might be able to restore it. So far I've restored the Rogers firmware over Odin and tried installing a custom rom/recovery too. I'm still getting this problem unfortunately. The IMEI reported with *#06# and in the status screen does match the sticker on the inside of the phone.
So I'm sure everyone's going to suggest that the phone was stolen and the IMEI has been blacklisted. My provider (Fido/Rogers) apparently doesn't care if the IMEI is blacklisted, they'll let it run anyway. I called up Fido anyway (since I'm a Fido customer) and asked them about the IMEI of this phone and they say they don't have any record of anyone calling in reporting it stolen and they don't have an IMEI database so she didn't have much to say about it.
Does anyone have any other suggestions? I've also flashed just the kernel, and I will flash a modem onto it too. I know my SIM card works, and both my SIM card and the last owners SIM cards don't work. I know the radio works because it picks up the emergency signal fine, and the SIM tray isn't damaged because when I put in my Fido SIM the Fido APN's automatically come up, as well as the lock screen goes from "No SIM inserted" to "unregistered SIM." Could my EFS partition be borked? Wifi works and IMEI shows up correctly.
The buyer said he would take the phone back if I can't fix it, but I want to try a bit more before I give up. If anyone has any ideas or suggestions, that would be great. Thanks a lot in advance XDA!
Summary:
-Used S4
-Owner flashed something wrong in Odin
-Gets "Not registered to network" error, unregistered SIM error
-Tried restoring
-Tried new ROM/Recovery
-Carrier says IMEI is fine, also tried directly registering the IMEI to my account
-IMEI is correct in settings/sticker on back of phone
-Wifi/everything else all works
Sounds like it's SIM locked to a different network. Try the the guide here: http://forum.xda-developers.com/showthread.php?t=2285431
MatinatorX said:
Sounds like it's SIM locked to a different network. Try the the guide here: http://forum.xda-developers.com/showthread.php?t=2285431
Click to expand...
Click to collapse
My girlfriend has a Bell sim, which when we insert, gives us the "Please enter unlock code" screen.
My sim does not do that. I know this device is for my carrier, but I figure the easiest way to get this going is to just unlock it and see if the problem persists on other networks.
I've tried that unlock tutorial before. The first time I tried it, when I just got the phone from the previous owner, it said "Golden-backup does not exist" so I couldn't do the restore step of that guide. After Odin-flashing everything and starting over, I can't even get into the UMTS menu anymore! I'll try another restore and give it another go though.
Edit: Another problem. I did a restore again using Odin and notices that it never properly wipes the phone. When I finish flashing, my Wifi still autoconnects on first boot, and every few seconds, a process crashes causing the phone to freeze. Has anyone heard of this kind of problem before?
Quick update:
Managed to Odin-flash it to the earliest firmware I could find for the phone without any crashing or freezing problems. Trying to do the network unlock method mentioned online. It does not work, even though I'm following the instructions to a T. Could it be that my EFS partition is borked and that the NV rebuild can't happen, meaning my radio configuration would also be borked?
Edit: Oh and when I booted up my phone for the first time, the phone was actually ON Fido! But within a few seconds, it went back to "Emergency calls only."
Hmm, that is some odd behavior, and definitely not a carrier lock. Shame it's never that simple to fix.
Not quite the same as your issue, but I lost my ability to make and receive calls after flashing a newer modem on an AOSP firmware. Flashing custom kernels, older modems, the latest stock rom and kernel were no help at all. I tried everything I could think of short of groveling. In the end the only way I got everything working again was to flash the original factory firmware my phone shipped with, factory wipe it from stock recovery, then flash it again. If you've already tried that (and I'm guessing you have), consider contacting Samsung regarding warranty. They've been really good to me in the past, even with second-hand phones.
I can confirm that Odin doesn't clean everything out. In my trials I also noticed that flashing via ODIN without a factory reset presented no setup wizard, caused lots of FC's and left some previous files hanging around.
Sounds like a bad sim tray.
Sent from my SAMSUNG-SGH-I337 using xda premium
make sim fit tighter
graydiggy said:
Sounds like a bad sim tray.
Sent from my SAMSUNG-SGH-I337 using xda premium
Click to expand...
Click to collapse
I had trouble with my handset after it got run over in the street, making it's otterbox earn it's money. The only bad symptom after that episode was Emergency calls only kept recurring.
I cut a tiny square of transparent scotch tape, avoided touching the sticky side, and placed it squarely on the SIM chip's backside, to make it fit the sim slot more snugly. It sounds like you should try stacking two or three layers on your chip as it sounds to be more loose than mine is.
Hi everybody! Thanks for all the help trying to fix it! It ended up being that the guys the previous owner had unlock it used the debug-menu unlock method and my phone was one of the ones that doesn't accept it. Lots of other people complained about similar problems as me in the free unlock method thread. In the end, I paid for the FastGSM USB Unlock method and it fixed the problem.
OH MY GOSH YOU JUST SAVED ME from buying another phone!! THANKS so much.. I added 3 layers of tape on the back of my sim and it works!!! weird.. cause I have the Dual Sim.. and it was the first sim that would not work. the second sim was fine.. anyways.. THANKS SO MUCH!!

[Q] i9505 cannot register on network

Ok so here's my problem.
I have an I9505 previously with a GE custom ROM and modem version XXUEML2, everything was working fine so far, the only "strange" thing was whenever I reboot the device the Cell Network will take about 3 minutes to reconnect, and I constantly lost the 4g connection which I attributed to problems within my carrier.
So a couple days ago I re-installed my custom ROM (was having problems with the Kernel) and after it boot back I wait to my Cell Network to connect, which never happen. So I went ahead, format everything, re-install the custom ROM and no luck.
I tried everything, updating the Baseband to XXUEML6. Install the Stock ROM (which was locked, but the store where I get it unlocked it by warranty), install another Stock ROM (right now I have the I9505XXUFNC4_I9505PHNFNC1_PHN ROM) and I still cannot get signal).
Did my modem just died, or the "warranty" guys unlock my device in a wrong method. I don't think is a problem with my IMEI 'cause I still have the same as the dive box says.
Hope someone can guide me before I take it back. Thanks.
vicmns said:
Ok so here's my problem.
I have an I9505 previously with a GE custom ROM and modem version XXUEML2, everything was working fine so far, the only "strange" thing was whenever I reboot the device the Cell Network will take about 3 minutes to reconnect, and I constantly lost the 4g connection which I attributed to problems within my carrier.
So a couple days ago I re-installed my custom ROM (was having problems with the Kernel) and after it boot back I wait to my Cell Network to connect, which never happen. So I went ahead, format everything, re-install the custom ROM and no luck.
I tried everything, updating the Baseband to XXUEML6. Install the Stock ROM (which was locked, but the store where I get it unlocked it by warranty), install another Stock ROM (right now I have the I9505XXUFNC4_I9505PHNFNC1_PHN ROM) and I still cannot get signal).
Did my modem just died, or the "warranty" guys unlock my device in a wrong method. I don't think is a problem with my IMEI 'cause I still have the same as the dive box says.
Hope someone can guide me before I take it back. Thanks.
Click to expand...
Click to collapse
Hi .
I guess that you checked your setting , data is enable , network mode.....and if your APN settings were correct
MAX 404 said:
Hi .
I guess that you checked your setting , data is enable , network mode.....and if your APN settings were correct
Click to expand...
Click to collapse
Yeah, already check that, but the problem is that I cannot even make phone calls.
vicmns said:
Yeah, already check that, but the problem is that I cannot even make phone calls.
Click to expand...
Click to collapse
I am a little lost with the unlocking thing, why you had to unlock your phone ? it was from a different carrier ? once is unlocked it remains unlocked ..what method he used ?
MAX 404 said:
I am a little lost with the unlocking thing, why you had to unlock your phone ? it was from a different carrier ? once is unlocked it remains unlocked ..what method he used ?
Click to expand...
Click to collapse
Well, when I bought the device, it was intended to be unlocked, but for a strange reason my device (only mine 'cause we bought 2 the same day) came carrier locked (MEO from Portugal) So I sent it back to warranty. After a week I get my device back "unlocked" (Same ROM, IMEI) but I notice that it was rooted, which only makes me think that they take it to a third party which unlocked the cellphone with a method that required root. I didn't care, I had signal and 3G,
The problems of buying stuff online...
vicmns said:
Well, when I bought the device, it was intended to be unlocked, but for a strange reason my device (only mine 'cause we bought 2 the same day) came carrier locked (MEO from Portugal) So I sent it back to warranty. After a week I get my device back "unlocked" (Same ROM, IMEI) but I notice that it was rooted, which only makes me think that they take it to a third party which unlocked the cellphone with a method that required root. I didn't care, I had signal and 3G,
The problems of buying stuff online...
Click to expand...
Click to collapse
There use to be possible using this guide, with the old firmwares as far as i know is not possible anymore unless you still have that firmware
http://forum.xda-developers.com/showthread.php?t=2282683
The other way is by an unlocking code ( you can buy in many places) once is unlock , stays unlock..no matter what you flash
Try something go Settings/connections / More networks/Mobile networks/ network Operator/ choose your carrier and see if it let you register, try others and see what kind of message you get
MAX 404 said:
There use to be possible using this guide, with the old firmwares as far as i know is not possible anymore unless you still have that firmware
http://forum.xda-developers.com/showthread.php?t=2282683
The other way is by an unlocking code ( you can buy in many places) once is unlock , stays unlock..no matter what you flash
Try something go Settings/connections / More networks/Mobile networks/ network Operator/ choose your carrier and see if it let you register, try others and see what kind of message you get
Click to expand...
Click to collapse
Already tried to choose my carrier, but sometimes it doesn't even appear, and when it does, connecting to it just throws and error saying "Not Registered On Network".
What I fear is that somehow they unlocked it using the Ariza patch (or other unlock method) which should not be used.
Also after digging some info, that kind of error happens when the device have been IMEI locked, which could be also a possibility given that my SIM works on any other device, but not otherwise. I will have to give a call to support service to discard this theory.
vicmns said:
Already tried to choose my carrier, but sometimes it doesn't even appear, and when it does, connecting to it just throws and error saying "Not Registered On Network".
What I fear is that somehow they unlocked it using the Ariza patch (or other unlock method) which should not be used.
Also after digging some info, that kind of error happens when the device have been IMEI locked, which could be also a possibility given that my SIM works on any other device, but not otherwise. I will have to give a call to support service to discard this theory.
Click to expand...
Click to collapse
Hi ,
I also feel the same that is the problem , it has not been unlock right.
check with them , let me know what they tell you.
Ok, I have more information, typing on the dial *#0011# to get the Service Mode Menu, it says at the bottom IMEI CERTI: NA. But if y dial *#06# I get my correct IMEI, is something wrong with the EFS folder?
vicmns said:
Ok, I have more information, typing on the dial *#0011# to get the Service Mode Menu, it says at the bottom IMEI CERTI: NA. But if y dial *#06# I get my correct IMEI, is something wrong with the EFS folder?
Click to expand...
Click to collapse
Hi ,
Just cheked mine , it said PASS
For sure something happen when unblocking the phone

[Q] Voice: out of service. S5-G900F

someone save me please... I've been struggle for two weeks...
I'm using S5-G900F, its a Hongkong version, and I'm currently in UK with giffgaff. last month I tried few new rom and then I can't use voice service any more. However I still have internet. Some detail below:
APN
1. I 100% sure its not an APN problem
IMEI
1. IMEI seems ok, start 4 digit 3524****
SIM card related
1. At first I assume it's a SIM card related problem, I tried 2 SIM with different ISP, neither work.
2. Also, I put those 2 SIM on my iphone4 to verify that the SIM is good, and both card work.
3. I also checked the SIM card cable, I put one piece of paper above the SIM to tight the contact, still doesn't work.
Phone related
1. Before I brought the phone, I had check the bands it supports, and it is capable to used here. And the phone work perfect (well, with stock firmware its really slow) before everything happen.
2. Since I brought this phone in HK and now I'm in UK, I tried to flash both latest UK and HK firmware (lollipop), neither work.
3. I also tried only flash baseband from that two firmware plus one old-version baseband. none work.
4. For those flash mentioned above, I do full wipe.
Rom
The rom I tried list below (in time sequence)
1. XtreStoLite (the BL/baseband is extract from Brazil stock firmware. After that problem occur, but I didn't realize)
2. CM12 (this two are all from this forum)
3. TGY-G900FZHU1BOA1-20150120092320 (HK stock firmware, 5.0. Try to recovery the voice)
4. BTU-G900FXXU1BOB7-20150223084756 (UK stock firmware, 5.0. Still trying)
5. Also 2 baseband/BL from XtreStoLite thread (Another is an old-version. Still).
So now for everyday, I had to carry two phone... one just to make sure I don miss any call.... I have tried and still no clue... really need some help here.... Help please...
Tian02 said:
someone save me please... I've been struggle for two weeks...
I'm using S5-G900F, its a Hongkong version, and I'm currently in UK with giffgaff. last month I tried few new rom and then I can't use voice service any more. However I still have internet. Some detail below:
APN
1. I 100% sure its not an APN problem
IMEI
1. IMEI seems ok, start 4 digit 3524****
SIM card related
1. At first I assume it's a SIM card related problem, I tried 2 SIM with different ISP, neither work.
2. Also, I put those 2 SIM on my iphone4 to verify that the SIM is good, and both card work.
3. I also checked the SIM card cable, I put one piece of paper above the SIM to tight the contact, still doesn't work.
Phone related
1. Before I brought the phone, I had check the bands it supports, and it is capable to used here. And the phone work perfect (well, with stock firmware its really slow) before everything happen.
2. Since I brought this phone in HK and now I'm in UK, I tried to flash both latest UK and HK firmware (lollipop), neither work.
3. I also tried only flash baseband from that two firmware plus one old-version baseband. none work.
4. For those flash mentioned above, I do full wipe.
Rom
The rom I tried list below (in time sequence)
1. XtreStoLite (the BL/baseband is extract from Brazil stock firmware. After that problem occur, but I didn't realize)
2. CM12 (this two are all from this forum)
3. TGY-G900FZHU1BOA1-20150120092320 (HK stock firmware, 5.0. Try to recovery the voice)
4. BTU-G900FXXU1BOB7-20150223084756 (UK stock firmware, 5.0. Still trying)
5. Also 2 baseband/BL from XtreStoLite thread (Another is an old-version. Still).
So now for everyday, I had to carry two phone... one just to make sure I don miss any call.... I have tried and still no clue... really need some help here.... Help please...
Click to expand...
Click to collapse
Can anyone help me please....
Was the phone service working for you before you tried a new ROM?
I have the same issue. Can't make or recieve calls. Internet is working though.
When you try to call someone, do you get 'call ended' message almost immediately after dialing out?
Also, when you go to phone / settings / additional settings (or more settings) - does the 'network or sim card error' pop up?
Can't figure this out... Hopefully someone would be able to point us to right direction, other than to replace it
And of course I did a factory reset, new roms, modems, everything there is to try. nothing helped
could it be because of Region Locking? Maybe it's locked again after flashing?. I want to buy this phone but I am not sure if it will get region locked again after it gets updated or custom flashed.
Kamco said:
Was the phone service working for you before you tried a new ROM?
I have the same issue. Can't make or recieve calls. Internet is working though.
When you try to call someone, do you get 'call ended' message almost immediately after dialing out?
Also, when you go to phone / settings / additional settings (or more settings) - does the 'network or sim card error' pop up?
Can't figure this out... Hopefully someone would be able to point us to right direction, other than to replace it
And of course I did a factory reset, new roms, modems, everything there is to try. nothing helped
Click to expand...
Click to collapse
Yes, before I flash those ROM everything goes well. I'm currently using CM12 so I don't have the setting you mention. But anyway I never seen that pop message before. I guess the SIM card work good as the phone can connect to the internet (not wifi, cellular internet).

[Q] Galaxy S4 unlock issues

Hi,
I have a Galaxy S4 i9505 lte that was locked to three Ireland, I unlocked it using the guide http://forum.xda-developers.com/showthread.php?t=2282683.
I put my meteor ireland sim card in the phone and it was not recognised, no pin request, nothing. I put my wife's meteor sim card in and it worked no problem, i put another meteor sim in and it worked no problem, both times asking for pin number.
I put my meteor sim in another phone and it worked no problem, even asking for a pin number.
I went to the meteor shop and exchanged my sim card in the hope it was the card and not the phone. I put the new sim card into the phone and it asked for a pin number but would not work, it worked in three different phones but not my phone and three different meteor sims worked in my phone no problem.
I tried different roms both times, stock-cyanogen-others, none worked with mine and all worked with the other sims, so I guess the phone is unlocked.
Am I missing something, maybe in *#0011# settings that my number is locked out of the phone even though it worked on Three Ireland.
I hope someone can help me.
Whytie
You need to downgrade your modem. Read the last pages of that thread. There is all you need.
Possible try the setting in the hidden menu. I have the E300K I put a different Sim card and it would not register. I went into the hidden menus and changed some of the settings and forced it to read the card and change carriers. I can't tell you exactly what they were I don't have the phone in front of me right now, I'm at work.....if you use *#0011#, you will need to hit back, then key enter, type Q0 and enter or Q000 and enter, wait about 10 seconds or so it will put you in the hidden menu, or you could type the main code and password. Not sure what it would be for your phone.
@2ndcarpenter: Misread the post? The OP had already tried the service menu unlock and found it didn't work. The reason? He didn't downgrade his modem, as mentioned about a half dozen times by me in that thread.
Hi,
Thanks for the replies, but I guess you did misread the post.
I done the guide, which I couldn't have done if I didn't have an older modem.
The unlock actually works with the other meteor sims, just not with my meteor sim, and the sim definitely works in other phones. The pin request I was talking about was the 4 digit sim security one, not the network unlock pin.
So I am still at a loss as to what is wrong.
We all likely misread your post. Now that you explained things however, it's become much more clear. Did you use the service menu method to unlock the S4, or did you use RegionLock Away? The possibility exists that the service menu method may have triggered the SIM pin. If that is the case, then you need to go back into the service menu and set Perso SHA 256 to its original setting. From there, root and run RegionLock Away. If you ran RegionLock Away and it did this, you may be stuck. RegionLock Away's ability to completely unlock the phone is an unintended side effect of its real function, which is to remove Samsung's regional lock list. Chainfire doesn't provide support for the unintended side effect.
Hi,
I used the service menu method to unlock, I will try regionlockaway and see if that maybe will make a difference.
I am already rooted on lollipop but do you think I should downgrade modem again and then run regionlockaway.
Thanks.
Downgrading is required for either unlock method to work.
Strephon Alkhalikoi said:
@2ndcarpenter: Misread the post? The OP had already tried the service menu unlock and found it didn't work. The reason? He didn't downgrade his modem, as mentioned about a half dozen times by me in that thread.
Click to expand...
Click to collapse
Did I misread the post? No, I saw a link which I did not check, and I saw that he 'tried' *#0011#, but I didn't see that he was able to get to the hidden menu. *#0011# does not get you to the hidden menu, it gets you to a debug screen. But I'm sure an expert like yourself already knows that. So without a better explanation I wasn't sure exactly what he tried. I am only trying to offer advice to someone on a device that I don't even use anymore. I still own it and test various firmwares and kernels, but do not use for my daily driver. But between work and my CCNA certification class, I have very little time, so I will stick to what is more important.......me and my education.

"No SIM card detected" & "No service"

Hi all,
I have a problem with my XC, i hope there's someone here who could help me out with this .
I get a SIM card error when i start the phone. After a while (5-10 mins) the error transforms into "No Service" as if the phone now detects the SIM card but has no service whatsoever.
Things i did to my phone prior to this:
- unlocked bootloader
- installed custom recovery
- root
- installed custom ROM
- drm fix
The phone did function properly for a few months actually after these operations without a SIM card error even once. But then i tried to install custom ROMs again (and i'm sure didn't flash ROMs not suited for XC) -actually tried to install "existenz" ROM but i did get a bootloop so i -once again- did the usual procedure with flashtool and flashed a firmware to set everything back to stock as close as possible. That was, when i started to get the SIM card errors. After several restarts (cold and warm) the phone sometimes recognized the SIM card and i could use the phone normally. But this was true only till the next restart, where i got the same SIM errors again.
Things i tried:
- flashed several different firmwares (official) with flashtool (wiping everything) - all the newest firmwares.
- *#*#72786#*#* in dialer to wipe carrier settings
- *#*#4636#*#* in dialer to go into phone settings and changing those settings randomly
- flashed another AOSP based custom ROM instead of stock sony
- wiping and formatting everything between the flashes of course
- cleaning and re-inserting SIM card (which i never took out before anyway)
But unfortunately nothing worked. Phone keeps to not recognizing the SIM card (which is working just fine in another phone). Everything else works just fine on the phone. The IMEI is displaying correct. I'm almost certain that the fault isn't hardware-based (i didn't drop the phone or exposed in water etc.) but software-based. Did i just managed to brick my phone by flashing something related to the modem which i'm not aware of?
I can't find any solutions on google, which help me, which is why i'm posting it here. Sorry for the long post.
Did anyone experience such an error and/or knows what else i could try to fix this? I hope for answers
Thanks in advance!
Anyone?
I've got the same problem.
I didn't unlock the bootloader or anything prior to getting the bug.
I wanted to downgrade to nougat, because aparently it helped someone in the forum below, but I didn't manage to do it.
https:// de.ifixit. com/Antworten/Ansehen/468864/Sim+Card+not+picking+up+mobile+network.+Possible+software+issue+(Oreo)
Did you try nougat, when flashing different firmwares?
Your post makes me question if its worth it, trying to downgrade.
Try to remove sd card if you have one. then restart the phone and see if sim card is recognized.
I had the same problem and I think it was a hardware failure in the end.
I also tried almost all the things you were writing above. In my phone it started slowly. Sometimes the SIM was detected but after some time the connection was lost.
It happened some time after I installed a new battery.
But since there are no original batteries available for the device anymore and the new battery was even worse than the 5 year old original battery, I gave up investigating the SIM issue and don't use the phone any longer.
I bought a new (used) x compact because I still like the size and I saw some development was going on for this device.
In the end I cannot tell whether the SIM was not detected because I broke something while changing the battery or due to age of the phone but I think it was a "normal" failure.
I also read from others that they had the problem and the SIM was working for some time after I switched the battery before it stopped working.
Nevertheless. Good Luck to you. Maybe it is something different on your phone.

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