Following an additional guide to make the below mentioned xda-developers guide really working to unlock LTE baseband 20 and to modify the available basebands as individual as you want. This guide works only for phones with Qualcomm CPU’s not for such with Mediatek CPU’s. That means it does not work for the Redmi Note 4 and others equipped with a Mediatek processor.
Following some clarifications about Xioami phones and LTE 20. All Xiaomi phones are able to enable LTE 20. But officially Xioami dos not. Xioami sells only in the Asian markets and there baseband 20 is not used. In Europe basebands 3/7/20 are used and especially in Germany band 20 (800MHz) is important to have. Further the specifications on their own website are not correct about the enabled LTE basebands. I bought a Redmi 3S, Redmi Note 3, Redmi 4 and a Redmi Note 4 all from Xiaomi directly in China. Originally the phones were enabled as following:
Redmi 3S and Redmi 4: FDD-LTE: B3/B7 and TDD-LTE: B38/B39/B40/B41
Redmi Note 3 and Redmi Note 4: FDD-LTE: B1/B2/B3/B4/B5/B7/B8 TDD-LTE: B38/B39/B40/B41
What does it mean: Redmi 3S and Redmi 4 can be used limited in Europe for LTE and Redmi Note 3 and Redmi Note 4 can be used limited in Europe and USA for LTE.
Baseband 20 is missing in any case.
Prerequisites:
After that follow the guide from xda-developers. It worked for me very reliable. Enjoy full LTE connectivity.
Following some clarifications about Xioami phones and LTE 20. All Xiaomi phones are able to enable LTE 20. But officially Xioami dos not. Xioami sells only in the Asian markets and there baseband 20 is not used. In Europe basebands 3/7/20 are used and especially in Germany band 20 (800MHz) is important to have. Further the specifications on their own website are not correct about the enabled LTE basebands. I bought a Redmi 3S, Redmi Note 3, Redmi 4 and a Redmi Note 4 all from Xiaomi directly in China. Originally the phones were enabled as following:
Redmi 3S and Redmi 4: FDD-LTE: B3/B7 and TDD-LTE: B38/B39/B40/B41
Redmi Note 3 and Redmi Note 4: FDD-LTE: B1/B2/B3/B4/B5/B7/B8 TDD-LTE: B38/B39/B40/B41
What does it mean: Redmi 3S and Redmi 4 can be used limited in Europe for LTE and Redmi Note 3 and Redmi Note 4 can be used limited in Europe and USA for LTE.
Baseband 20 is missing in any case.
Prerequisites:
- Phone must be unlocked and rooted!!
- Qualcomm diag drivers: http://forum.xda-developers.com/attachment.php?attachmentid=3682462&d=1457939914 (Mi5_Qualcomm_Drivers works for all here mentioned phones. The Mi2 drivers did not work.)
- Minimal Fastboot and ADB
- Guide : http://forum.xda-developers.com/redmi-note/general/unlock-lte-bands-step-step-xiaomi-mi-t3084774/
- Hex/Dec/Bin converter
- adb devices
- adb shell
- su (confirm in your phone)
- setprop sys.usb.config diag
After that follow the guide from xda-developers. It worked for me very reliable. Enjoy full LTE connectivity.
