On this instruction i will show to you how you can edit Sony Xperia 1 II 5G NR/LTE-A Bands / Carrier Aggregation Combinations with Qualcomm Software. Sony has limited band and carrier aggregation support per network.
You can check in cacombos.com Xperia 1 II supported Carrier Aggregation combinations.
This instruction is for Xperia 1 II. If you have Xperia 1, follow instruction here or XZ2 follow instruction here. Before you follow instruction, make sure you have already rooted Sony smartphone. Be careful, because this can make your device unusable.
- USB-cable between your desktop and phone
- On desktop, you must have platform-tools downloaded and drivers for your Sony phone
- QPST-application. Please find application from internet
Please enable under Developer Tools USB-Debugging on your Android phone. Then connect your phone with USB-cable to desktop. Make sure your USB-default action is “No data transfer”.
Open command line and run adb shell -command:
enable Qualcomm diag:
XG-AT51:/ $ su XG-AT51:/ # setprop persistent.sub.eng 1
Your phone will now automatically disconnect and reconnect again. If you phone prompt “Allow Access?” dialog, please Deny because this change setprop value back to default. On Device Manager, you should see now list of Unknown devices. Search XG-AT51 -driver where Hardware Ids is something like MI_01.
Download and Install Qualcomm Modem Driver to this device using Update Driver function. Select Browse my computer for driver software -> Let me pickup from a list of available drivers on my computer -> Show all Devices -> Then Have disk and find driver file on your computer.
Select qcdm.inf file on extracted folder. Then install Qualcomm Android Modem 2020. Your computer will warn about compability but continue still installation.
When you have installed, open QPST-application and go to ports tab and click Add new Port…
Uncheck Show Serial and USB/QC Diagnostic ports only and select now device.
Now you should se phone in Active Phones and Ports tab. If you do not see phone on list, please make sure you do not have Network Signal Guru App same time open on your phone. It use same interface as QPST so cannot run same time.
You can now make backup with Start Clients -> Software Downloads -> Backup before do any changes.
Now you have backup so we can open EFS Explorer (Start Clients -> EFS Explorer). Select your device and wait a moment.
Then go to policyman folder. On latest Xperia phone, there is many XML files so i recommend copy all to your computer and backup these. If there is _Subscription_01.xml file, it’s for second SIM-card.
You can now modify band limitations in band_set_01.xml file and carrier aggregation combinations in lte_features_x.xml files. After modify file, please make sure XML syntax is correct and upload file back to phone. Reboot your phone and then your phone load latest configuration.
Disable Xperia System Service
I recommended disable Xperia System Service on Xperia 1 phone so then it doesn’t load default configs when you swap SIM-cards with Disable Applications [Root] -app.