So I tried this value "2061584826564" for the NV06828 (in QXDM for the LTE BC Config).
There's no NV06829.
I wrote, and adb reboot the phone. I had to re-enable diag in adb, so I could actually "read" the value. After doing that, the new value is still set.
So I disabled the diagnostic mode in adb, rebooted the phone.
The phone works, I don't know if changing that value has enabled more bands, at least it appears to work and is not bricked.
I'm not sure the simcard I got to test supports LTE (lol), or if it has data, I will check and report.