Here it is.
Windows PC required.
Preparation
1. Install samsung usb driver from
here.
2. Install Qualcomm QPST tool from
here.
3. On your phone's stock dialer, dial *#0808#, select RNDIS + DM + MODEM (+ ADB) and click OK. This enables your phone's diagnostic mode needed to access phone's EFS files.
4. Connect your phone to the USB port of your pc.
5. Open QPST Configuration installed on your PC. Go to
Active Phone tab and check if your phone already appears. If not yet, do the ff:
- Go to
Ports tab and Click on the
Add new Port button at the bottom.
- You can see the list of ports. Select the one that says SAMSUNG Mobile USB Serial Port. If more than one appears, you can add them both. But It's usually the COM5 port.
- Once you select this you can see the
Active Phone tab the connected phone. There should be non-zero ESN value on the correct port.
6. Go to
Start Clients menu and click
EFS Explorer. Select the correct port and click Ok. Wait for EFS Explorer to finish loading.
7. Once loaded, ensure that
Exclusive Access is checked under
Phone menu.
Removing 4G Carrier Aggregation (CA) pruning/limitation to improve 4G+detection
- In EFS Explorer, navigate to nv/ item_files/modem/lte/rrc/cap and delete
prune_ca_combos and
prune_ca_combos_Subscription01 files.
Info: These 2 files limits the 4G CA that our device can do. The 2nd file is for SIM2. Some of our telcos 4G CA combinations are not included in these files. Deleting them removes the limitation.
Other stuff you can do:
Remove 5G CA pruning/limitation
- In EFS Explorer, navigate to /nv/item_files/modem/nr5g/RRC/ and delete cap_prune and cap_prune_Subscription01 files.
Enabling VoNR guide here
(but I am not sure if our telco here already implemented VoNR. This is similar to VoLTE but for 5G)
Some guides and tweaks using QPST for qualcomm modems can be found in
https://band.radio/
Hope we can find out how to remove GCF NR whiltelist soon.