Ver 1.5 AT+CHE=2 not setting the correct sub band uplink channels

[gfnord]

The AT+CHE to setup the sub band uplink channels is not working on version 1.5.
I setup AT+CHE=2 (sub-band 2 US915, channels 8-15)
903.9 904.1 904.3 904.5 904.7 904.9 905.1 905.3
But the LSN50 are still using the frequencies on sub-band 1, channels 0-7.

[endriwidodo]

Lets try this AT Command steps,

ATZ
AT+ADR=0 -> replay should be OK
AT+DR = 3 -> replay should be OK
AT+CHE=<set your frequency transmit here, example 912100000> -> replay should be OK
AT+NJM=0 -> should be OK (for ABP join mode)
AT+CHE=2
finally ATZ again.
check result with command AT+CFG, settings above must be proper on result.