EM9191 Band Locking

[Esoteric]

Can anyone help me come for the AT command to either Band lock to n41 or to disable Band n71?

I know for a fact that I have coverage for this band because my phone is able to pick it up fine, I'm worried that my modem/enclosure is damaged because the modem will only connect to n41 for a few seconds before reverting to n71(as seen in the debug output from ROOter).

All the guides I can find are for 4G masking only, and it appears that I need to do a combo 4G+5G band mask which is a bit confusing to me.

I'd be happy with just a simpler command that locks to NRSA n41 so that I can at least test if it is my modem that is giving me issues.

[Esoteric]

I think I figured it out.

AT!BAND=12,1,"n41",4,0000010000000000,0000000000000000,0000000000000000,0000000000000000,0000000000000000

creates a nrsa band lock at index 12 for only n41

selectable via AT!Band=12

[Didneywhorl]

You got it, but you can drop the last 2 sets of zeros:

AT!BAND=12,1,"n41 SA",4,0000010000000000,0000000000000000

...or at least on the latest firmware you can.

IF you want to also add some NSA bands or LTE bands you will have to run separate commands (1 for LTE ,3 for NSA, 4 for SA, 0 for WCDMA) to add to it. If you want to add or change the bands just run it again with exactly the bands you want to use.

[Didneywhorl]

Sierra5G-BandLocking-TWH-08-16-2022.pdf

I wrote this up to help.

[Didneywhorl]

Use AT!BAND?

To see your custom bandlock profile to see if it has any other bands enabled (LTE/WCDMA/NSA/SA)

[dag777]

Hey guys. Sorry for reviving an old thread, but I'm trying to figure out how to enable the other 5G bands the EM919x technically supports, like n25, for instance. Any clue what band n25 translates to? Thanks

[Didneywhorl]

n25 would use the same mask as b25: 0000000001000000