XMD 2004/2005 - Network Mode -> preselection with sim2 - Sony Xperia M

Hi,
I`m using my XMD (Android C2004_15.5.A.1.5) with two SIM cards active
I have a problem with the Network Mode Preselection Settings.
I`m working with two different modes for Network Mode Preselection.
On mode A without a problem, on mode B with a problem.
Network Mode Preselection - Mode A (without a problem/error):
SIM1: WCDMA (preferred) GSM
SIM2: GSM only
It is working without any problems even after the mobile phone is switched off and on again .
Network Mode Preselection - Mode B (with a problem/error):
SIM1: GSM only
SIM2: WCDMA (preferred) GSM
There is a change of the Network Mode Preselection after mobile phone is switched off and on again.
SIM2 preselection is changed automatically to GSM only mode! That change will reduce the Mobile Data Speed extremly.
SIM1: GSM only
SIM2: GSM only
Any solution for that problem ?

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I can't switch to WCDMA ONLY in network type menu. I choose the network type, but nothing happens. No problem with 2G only, WCDMA Perferred, LTE/3G/2G.
But I could easily change the network with *#*#4636#*#*. But after a reboot, it's returns the network that is choosed in setting (usually 2G).
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Hayo Tee said:
I can't switch to WCDMA ONLY in network type menu. I choose the network type, but nothing happens. No problem with 2G only, WCDMA Perferred, LTE/3G/2G.
But I could easily change the network with *#*#4636#*#*. But after a reboot, it's returns the network that is choosed in setting (usually 2G).
My device is d2tmo. I tried all LineageOS based firmwares. All of there with this bug.
Can you help to fix this problem?
Click to expand...
Click to collapse
Try network switcher app
Sent from my GT-I9505 using Tapatalk

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