Mi8 EE no LTE signal. only 3G or EDGE

[bentstan]

Hey guys,
since 2 weeks my Mi8 EE cant connect to LTE anymore. Dont know if it is since an update or what happened that it cant connect.
I had the weekly rom from here installed, waited 1 or 2 updates but nothing changed. Then I decided to check the SIM in my old phone and there I had immediately LTE signal. So it can only be the phone. (also testet another SIM and with another phone. Same situation).
I flashed the latest Chinese ROM with MiFlash Tool in fastboot Mode, but there was also no lte connection available.
Somehow my sensors were broke then, so I reflashed the persist.img and everything is fine with them now. But LTE is still not working.
Any ideas? Thanks.

 

[Karpfenhai]

Hey guys,
since 2 weeks my Mi8 EE cant connect to LTE anymore. Dont know if it is since an update or what happened that it cant connect.
I had the weekly rom from here installed, waited 1 or 2 updates but nothing changed. Then I decided to check the SIM in my old phone and there I had immediately LTE signal. So it can only be the phone. (also testet another SIM and with another phone. Same situation).
I flashed the latest Chinese ROM with MiFlash Tool in fastboot Mode, but there was also no lte connection available.
Somehow my sensors were broke then, so I reflashed the persist.img and everything is fine with them now. But LTE is still not working.
Any ideas? Thanks.

Check your preferred network, no issue on mine:

Regards

Sent from my MI 8 Explorer Edition using Tapatalk

 

[bentstan]

Preferred Network Type is set on GSM/WCDMA/LTE. I checked also the additional Options, especially the modem tools, in the CIT Menu. There it was set to LTE/UMTS (PRL).
Anyway, if I set one of them to LTE only i just get no signal. Meanwhile I think this is a hardware defect... or maybe you have another idea?

I also reset the APN: nothing changed. And setting up the APN manually for vodafone didn't help either.

 

[Karpfenhai]

Preferred Network Type is set on GSM/WCDMA/LTE. I checked also the additional Options, especially the modem tools, in the CIT Menu. There it was set to LTE/UMTS (PRL).
Anyway, if I set one of them to LTE only i just get no signal. Meanwhile I think this is a hardware defect... or maybe you have another idea?

I also reset the APN: nothing changed. And setting up the APN manually for vodafone didn't help either.

View attachment 28160

Hmm, that's weird then, I guess you already tried the other Sim slot? What happens with another carrier Sim card in your device?

Also try one of the helper tools, maybe they shed some light?



Sent from my MI 8 Explorer Edition using Tapatalk

 

[bentstan]

yes, I tried the other SIM slot already. Another carrier Sim card is a good idea. Will try this later when my friends come over.
Which helper tools do you mean?

 

[Karpfenhai]

yes, I tried the other SIM slot already. Another carrier Sim card is a good idea. Will try this later when my friends come over.
Which helper tools do you mean?

Lte discovery and such

Sent from my MI 8 Explorer Edition using Tapatalk

 

[bentstan]

I dont know really what I can read there (LTE discovery) but I get only information about my EDGE Connection. Every LTE related section is marked with N/A.
On the other hand do you know if all modem related partitions are overwritten when I flash a fastboot rom with MiFlash?
Because in this case I would argue that it should work?

 

[Karpfenhai]

I dont know really what I can read there (LTE discovery) but I get only information about my EDGE Connection. Every LTE related section is marked with N/A.
On the other hand do you know if all modem related partitions are overwritten when I flash a fastboot rom with MiFlash?
Because in this case I would argue that it should work?

Afaik the Modem is a part of the Rom yes, so the test button doesn't do a thing then? Hmm it seems your device “thinks“ it doesn't have lte Bands.. Since you already clean flashed everything..we're out of options, try to go back to an earlier Rom, way earlier, like oreo.

Or try to flash the modem only.

Did you test a different Sim?

Sent from my MI 8 Explorer Edition using Tapatalk

 

[bentstan]

Okay, will try to go back to an early version and let you know. I only tried Pie and this didn't help.
And yes, some minutes ago I tried an O2 SIM card but there was also only E available...

If that all doesnt help, I'm going send it to my insurance..

 

[zapatto]

Okay, will try to go back to an early version and let you know. I only tried Pie and this didn't help.
And yes, some minutes ago I tried an O2 SIM card but there was also only E available...

If that all doesnt help, I'm going send it to my insurance..

Hey! Did you find out how to fix it?
Im having the same problem in Argentina with my Note 8.
Someone said it may be the ROM... i have the 11.0.4. Global.. I believe is the latest.. Another guy said that Xiaomi phones have a software that "blocks" the bands of some countries and i have to change the ROM... i think this is nonsense...
I cant find out how to make it work.. is not the sim card because i can recive calls and sms.. so the sim its working but im not getting internet, non 3g non 4g.. internet works only with WIFI

 

[bentstan]

Hey! Did you find out how to fix it?
Im having the same problem in Argentina with my Note 8.
Someone said it may be the ROM... i have the 11.0.4. Global.. I believe is the latest.. Another guy said that Xiaomi phones have a software that "blocks" the bands of some countries and i have to change the ROM... i think this is nonsense...
I cant find out how to make it work.. is not the sim card because i can recive calls and sms.. so the sim its working but im not getting internet, non 3g non 4g.. internet works only with WIFI

Nope, I haven't figured it out yet. Rolling back to the initial release ROM for my device didn't help either.
Next week I'll try again to fix it...
But your problem sounds very similar. Meanwhile I get only connection over EDGE also...

 

[zapatto]

Nope, I haven't figured it out yet. Rolling back to the initial release ROM for my device didn't help either.
Next week I'll try again to fix it...
But your problem sounds very similar. Meanwhile I get only connection over EDGE also...

Ive spoken with my mobile company they tried to help me with the connection, but it doesnt work anyway. They gave me the Xiaomi contact but they response is like every 3 days (they take some time on answering). So today I told them my situation, now im waiting the response, maybe next week i will have an answer..
Which ROM do you have? Mine is 11.0.4
Rolling back phone software is not a good idea... I had bad experience doing that on a Samsung Galaxy S2 (some years ago) and in a DJI Drone... i got a beautiful paperweight

 

[Karpfenhai]

Ive spoken with my mobile company they tried to help me with the connection, but it doesnt work anyway. They gave me the Xiaomi contact but they response is like every 3 days (they take some time on answering). So today I told them my situation, now im waiting the response, maybe next week i will have an answer..
Which ROM do you have? Mine is 11.0.4
Rolling back phone software is not a good idea... I had bad experience doing that on a Samsung Galaxy S2 (some years ago) and in a DJI Drone... i got a beautiful paperweight

But no Internet at all seems to be a apn issue, try to create one manually.


Sent from my MI 8 Explorer Edition using Tapatalk

 

[bentstan]

Ive spoken with my mobile company they tried to help me with the connection, but it doesnt work anyway. They gave me the Xiaomi contact but they response is like every 3 days (they take some time on answering). So today I told them my situation, now im waiting the response, maybe next week i will have an answer..
Which ROM do you have? Mine is 11.0.4
Rolling back phone software is not a good idea... I had bad experience doing that on a Samsung Galaxy S2 (some years ago) and in a DJI Drone... i got a beautiful paperweight

I was on weekly 20.1.16, but I first noticed the bug on 20.1.9 (I think so).
Did you get an answer from Xiaomi already?

The only thing I could archive the last days was to get 3G/H signal back. Somehow only Edge was available after like hundreds of flashes.
Got it back with restoring an old backup from octobre last year. So seems like a software issue for me. I found many threads to this issue and many different ways of solving. Tried some of them, nothing changed. Most of them lost their IMEI and they tried to recreate the EFS Partition. Of course I have no EFS Backup (hate myself for that) to try that, but since both IMEI are available for me this shouldn't be the issue... or what do you think?

 

[KotwCzajniku]

Hi!
I have the same problem as you with my Mi8 EE :/
My data transmission die in July, i try to change ROM's Global/xiaoimi.eu, but it's not working.

 

[renato_cardoso]

[QUOTE = "bentstan, post: 526973, membro: 250688"]
Ei pessoal,
há 2 semanas meu Mi8 EE não consegue mais se conectar ao LTE. Não sei se é desde uma atualização ou o que aconteceu que não consigo conectar.
Tive a rom semanal daqui instalada, esperei 1 ou 2 atualizações mas nada mudou. Então decidi verificar o SIM do meu telefone antigo e imediatamente tive o sinal LTE. Portanto, só pode ser o telefone. (também testet outro SIM e com outro telefone. Mesma situação).
Eu atualizei a última ROM chinesa com a ferramenta MiFlash no modo fastboot, mas também não havia nenhuma conexão lte disponível.
De alguma forma, meus sensores quebraram então, então eu atualizei o persist.img e está tudo bem com eles agora. Mas o LTE ainda não está funcionando.
Alguma ideia? Obrigado.
[/CITAR]
Cara me deixa vocêDude let me tell you Was afraid of a problem that your device was with the same symptom as what I did I took in my friend my friend and he opened the device threw a hot air on the plate of that there right that the internal communication and the device came back normal

 

[kimyiu1029]

i have the same problem....mi 8 ee doesnt get LTE signal or jumps to H+ signal(the same location same sim card even redmi 2 can get LTE signal)....even worse, if i choose to lock 'LTE' signal, it returns either 'NO service' or '2G data' and cant even get back to HSPA..

 

[kimyiu1029]

Hi!
I have the same problem as you with my Mi8 EE :/
My data transmission die in July, i try to change ROM's Global/xiaoimi.eu, but it's not working.

hi there
did u mange to solve the mi8EE LTE problem?

 

[KotwCzajniku]

hi there
did u mange to solve the mi8EE LTE problem?

Unfortunately no :/
I am trying to change the antenna(cellphone service) , although I do not know if it makes sense?

 

[kimyiu1029]

Unfortunately no :/
I am trying to change the antenna(cellphone service) , although I do not know if it makes sense?

i m not sure whether its a software/hardware problem..when i look into this and searched in some chinese forum, more and more users reported similar issues since March 2020, all the symptoms are:

when both sim card slots are used(given that duel 4G is activated and no problems when both cards are used on other device/using single card):
1)card 1 can always receive 4G+ signal while
2)card 2 can only receive 3G(hspda) or 2G (E)

 

[KotwCzajniku]

i m not sure whether its a software/hardware problem..when i look into this and searched in some chinese forum, more and more users reported similar issues since March 2020, all the symptoms are:

when both sim card slots are used(given that duel 4G is activated and no problems when both cards are used on other device/using single card):
1)card 1 can always receive 4G+ signal while
2)card 2 can only receive 3G(hspda) or 2G (E)

thanks for the advice but i im a little bit lost, I use one card and I have 2G internet, so maybe inserting a second card will help? maybe some inactive card?