MR1100 - No option to upgrade firmware

Glad this helped mdknapp. I spent hours trying to find solution for this AT&T firmware issue so I posted my solution hoping it would help someone else.

Next logical step is to try bandlocking the MR1100. This boosted my speeds significantly. My newly flashed unit kept flipping between bands which was problematic. Now the MR1100 has been rock solid. Lots of posts on this but should mention a couple of findings:

1. Test all your bands for quality of signal. It takes time but worth it.

2. Test with multiple bands (carrier aggregation). MR1100 only worked with max of 3 bands for me. Once again takes time to test which combo works best. See CMD Generator for Bands: https://josh.sc/netgear-mr1100-band-generator/

Here's a putty session for command reference:

AT!GSTATUS?
!GSTATUS:
Current Time: 1030 Mode: ONLINE
System mode: LTE PS state: Attached
EMM state: Registered Normal Service
RRC state: RRC Connected
IMS reg state: No Srv

PCC:
LTE band: B30
LTE bw: 10 MHz
LTE Rx chan: 9820
RSSI (dBm): -81.8
RSRP (dBm): -112.7
RSRQ (dB): -12.7
RSSNR (dB): 10
Tx Power (dBm):
LTE Cell ID: 48819863
Physical Cell ID: 360
TAC: 19979

SCC1:
LTE band: B2
LTE bw: 20 MHz
LTE Rx chan: 850
RSSI (dBm): -91.2
RSRP (dBm): -112.5
RSRQ (dB): -12.3
Physical Cell ID: 254

SCC2:
LTE band: B4
LTE bw: 10 MHz
LTE Rx chan: 2000
RSSI (dBm): -92.5
RSRP (dBm): -111.9
RSRQ (dB): -10.4
Physical Cell ID: 287

SCC3:
LTE band: B12
LTE bw: 10 MHz
LTE Rx chan: 5110
RSSI (dBm): -83.7
RSRP (dBm): -101.6
RSRQ (dB): -8.9
Physical Cell ID: 360

AT!BAND=?
Index, Name, GW Band Mask L Band Mask L ext Band Mask
00, Auto, 0000000004C00000 000020003000085F 0000000000000002
01, WCDMA All, 0000000004C00000 0000000000000000 0000000000000000
02, LTE All, 0000000000000000 000020003000085F 0000000000000002

0000200000000000 - B46
0000000020000000 - B30
0000000010000000 - B29
0000000000002000 - B14
0000000000000800 - B12
0000000000000040 - B7
0000000000000010 - B5
0000000000000008 - B4
0000000000000004 - B3
0000000000000002 - B2
0000000000000001 - B1
0000000000000002 - B66
0000000004000000 - B5 (850)
0000000000800000 - B2 (1900)
0000000000400000 - B1 (2100)

ADDED THESE BANDS

AT!BAND=03,"LTE B2",0,2
AT!BAND=04,"LTE B4",0,8
AT!BAND=05,"LTE B12",0,800
AT!BAND=06,"LTE B30",0,20000000
AT!BAND=07,"LTE B12+B30",0,20000800
AT!BAND=08,"LTE B4+B12+B30",0,20000808
AT!BAND=09, "LTE B2+B12+B30", 0, 20000802

TO REMOVE LINE #, replace <number> with line # (no zero prefix)
AT!BAND=<number>,"",0,0

Note: May have to hard reboot hotspot for settings to work after removing lines.