s 66 (extension of Band 4) and

- US998 only- Bootloader unlocked- RootedFull system backup in case you don’t like what you’ve done.Performing these steps will remove the “default” unlocked bands. I have not figured how to get band to default. So insert disclaimer here about me, XDA, LG, and whoever you got your phone from being responsible for your phone.1. Go to play store and download “Shortcut Master (Lite):Or support the dev and download the full version:2. Launch Shortcut Master and grant it root access.3. Select the 3 dot menu and select “Search…”4. Verify “All apps” are being searched on the left. Click the “Enter text to search” and type in “BandSelection” and select “Search”5. You should see 5 items in the results. Select the “Hidden Menu com.lge.hiddenmenu.tmo_only.LTEBandSelection”optio n. In the subsequent popup select “favorite”. In the subsequent menu you can rename the shortcut to whatever you like or keep the default name shown. Select “Add” to complete the favorite selection. You should then be brought back to the 5 item search results.6. repeat step 5 and select “Hidden Menu com.lge.hiddenmenu.tmo_only.BandSelection” and repeat this step to add it as a favorite. Once done, hit the back menu button and this will return you to your 2 newly created favorite shortcuts.7. Select the “LTEBandSelection” shortcut (or whatever name you renamed it) to launch the LTE Band Selection app.8. Click the checkboxes for the bands you desire. Obviously as a TMO’er I would recommend Bands 2, 4, 12, 66, and 71 as these are the bands in use in the US. If you travel overseas you’ll need to select other bands.9. Click “Save” and you should see a “Save Succeeded” toast if your selections were successful, otherwise you will see “Save Failed”. At a minimum, I believe you need at least 1 LTE band (2, 4, or 12). Additionally, you cannot select the whole shebang of bands as well.10. At this point you are done and the selected bands will be active. You can verify the selected bands to be active by backing out of the menu back to your favorites, and select “BandSelection”. You should see your selected bands under LTE BAND. WCDMA / GSM should remain as Default unless you decided to mess with it.How do I get my LTE BAND back to default?Dunno at this point. You figure it out and let us know.Can I reset everything back to whatever I had originally?Restore that backup! Or factory reset I suppose…I have yet to personally verify Band71, but I would imagine it should work. You can verify the selected bands using another app like LTE Discovery. It shows you exactly what bands your phone is currently getting. I have confirmed that selecting single bands will only allow you access to that band (i.e you select BAND 2, you only get that band and no others).THANKS: vndnguyen for Shortcut MasterEDIT - Added some screenshots from the app...EDIT - I verified carrier aggregation goes away if I deselect Band 66 while connected to Band 4.