Telit LM940 Select Bands error

[RVroamer]

I'm trying select bands using the command AT#BND=0,4,300001A but it returns +CME ERROR: 4

AT#BND? returns:

#BND: 0,4,3000081A       

Even AT#BND=0,4,300081A returns the same +CME ERROR: 4

Is there another step that needs to be performed before selecting bands on this modem?

[BillA]

I'm trying select bands using the command AT#BND=0,4,300001A but it returns +CME ERROR: 4

AT#BND? returns:

#BND: 0,4,3000081A       

Even AT#BND=0,4,300081A returns the same +CME ERROR: 4

Is there another step that needs to be performed before selecting bands on this modem?

Possibly you need to send some kind of programming password before the band command, similar to the Sierra series.
Unfortunately there's little information on Telit modems. Even if you could get the programming password for one of their other models, it could help your figure it out (LE910C4-NF/LM940/LN940, FN980M).
Here's the LM960 AT Command manual:
https://y1cj3stn5fbwhv73k0ipk1eg-wpengi ... ide_r1.pdf

First, try resetting the modem to full factory settings via:
AT&F
AT&F1
Then to set it to auto-baud, enter:
AT+IPR


AT#BND?
Returns the current selected band in the format:
#BND: <GSM band>, < UMTS band>,<LTE band>

AT#BND=?
Returns the supported range of values of parameters <GSM band>, < UMTS band> and <LTE band>.
LTE bands shown as maximal bit mask for model in HEX.
Example:
AT#BND=?
#BND: (0),(1,2,4),(20003000281A) for AT&T
OK

20003000281A - bit mask means all combinations of next bands could be accepted by SET command
The rest of the bit masks are the same as in any other band calculator.

2 B2
8 B4
10 B5
800 B12
2000 B14
10000000 B29
20000000 B30
200000000000 B46

Example
AT#BND?
#BND: 0,18,A7E0BB0F38DF (for Generic)
OK
AT#BND?
#BND: 0,4,20003000281A (for AT&T)
OK
AT#BND?
#BND: 0,0,80000000101A (for Verizon)
OK
AT#BND?
#BND: 0,0,1000300081A (for Sprint)
OK

[RVroamer]

I tried again and the #bnd command is working again.