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4G does not work after update to Pie

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By PauloWesley, Junior Member on 9th December 2018, 02:44 AM
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I upgraded to Pie via ota, but my 4G does not work after upgrading, only 2g and 3g. Any solution for this?
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9th December 2018, 06:31 AM |#2  
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Quote:
Originally Posted by PauloWesley

I upgraded to Pie via ota, but my 4G does not work after upgrading, only 2g and 3g. Any solution for this?

+1 it happened to me too, haven't found a solution yet...
9th December 2018, 07:42 AM |#3  
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Have you updated via the VPN method?

Sent from my Mi A1 using XDA Labs
9th December 2018, 11:52 AM |#4  
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Originally Posted by TrueMS

Have you updated via the VPN method?

Yes
9th December 2018, 01:01 PM |#5  
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Try to select from list 2G and see if the modem works. then try one of the options offered. So I managed to get 4G
9th December 2018, 04:11 PM |#6  
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I think the problem is with the modem they used in Android Pie: it supports only B1 (2100), B3 (1800+), B5 (850), B40 (TDD 2300) and B41 (TDD 2500).
So 4G is working but only in countries where this bands are used. In Italy for example we have band 3 in highways and cities, but in rural areas we use band 20 and it's gone
I hope that they can solve the problem with a new update.

PS: Don't try to flash 8.1 modem over Android Pie stock rom. It will cause system crashes and SIM card won't work anymore until a reflash of Pie modem.
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9th December 2018, 06:13 PM |#7  
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Quote:
Originally Posted by TrueMS

Have you updated via the VPN method?

I did also

Quote:
Originally Posted by goran60

Try to select from list 2G and see if the modem works. then try one of the options offered. So I managed to get 4G

Can you please elaborate?
9th December 2018, 06:35 PM |#8  
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Updated using VPN method and i got no problems with signal. 4G works great like in Oreo. (Im from Portugal)
9th December 2018, 08:02 PM |#9  
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Quote:
Originally Posted by jack_21

I think the problem is with the modem they used in Android Pie: it supports only B1 (2100), B3 (1800+), B5 (850), B40 (TDD 2300) and B41 (TDD 2500).
So 4G is working but only in countries where this bands are used. In Italy for example we have band 3 in highways and cities, but in rural areas we use band 20 and it's gone
I hope that they can solve the problem with a new update.

PS: Don't try to flash 8.1 modem over Android Pie stock rom. It will cause system crashes and SIM card won't work anymore until a reflash of Pie modem.

It also happen with B7, at least for me. In Italy I use Iliad and.. there's no 4g available for me. 3g works but, if it's like how you said, we need to wait for the next update.
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9th December 2018, 09:30 PM |#10  
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Quote:
Originally Posted by nitroax

Updated using VPN method and i got no problems with signal. 4G works great like in Oreo. (Im from Portugal)

10.0.2.0 or other version of Firmware Pie?
9th December 2018, 10:09 PM |#11  
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Quote:
Originally Posted by Pjotr91

It also happen with B7, at least for me. In Italy I use Iliad and.. there's no 4g available for me. 3g works but, if it's like how you said, we need to wait for the next update.

Yes, i confirm that these are the only bands available after the update Click image for larger version

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