Hi All
l have modem RM521-F where was working fine for a year and half but now ,it can’t connect to 5G bands (NSA) , The modem can do only 4G+.
Antenna Ports on modems (visually) are ok
Antenna Connection (where I was getting N78 , N40 on NSA)
I tried all the solutions that came to my mind such as
ATI
Quectel
RM521F-GL
Revision: RM521FGLEAR05A02M4G
AT+QRSRP?
+QRSRP: -63,-140,-140,-140,LTE
OK
AT+QCAINFO
+QCAINFO: "PCC",500,100,"LTE BAND 1",1,36,-68,-9,-42,17
+QCAINFO: "SCC",1450,100,"LTE BAND 3",2,120,-60,-9,-33,12,1,100,19450
+QCAINFO: "SCC",1279,75,"LTE BAND 3",1,120,-63,-13,-42,14,0,-,-
+QCAINFO: "SCC",38956,100,"LTE BAND 40",1,68,-84,-11,-65,12,0,-,-
+QCAINFO: "SCC",39154,100,"LTE BAND 40",1,68,-83,-11,-64,9,0,-,-
OK
AT+QNWPREFCFG="nr5g_band"
+QNWPREFCFG: "nr5g_band",1:2:3:5:7:8:12:13:14:18:20:25:26:28:29:30:38:40:41:48:66:70:71:75:76:77:78:79
i tried
AT+QNWPREFCFG="mode_pref"
+QNWPREFCFG: "mode_pref",AUTO
AT+QNWPREFCFG= "rat_acq_order",LTE:NR5G
AT+QENG="neighbourcell"
+QENG: "neighbourcell intra","LTE",500,36,-10,-68,-37,-,-,-,-,-,-
+QENG: "neighbourcell inter","LTE",1450,120,-9,-60,-32,-,-,-,-,-
+QENG: "neighbourcell inter","LTE",1279,120,-11,-62,-44,-,-,-,-,-
+QENG: "neighbourcell inter","LTE",38956,68,-11,-84,-65,-,-,-,-,-
+QENG: "neighbourcell inter","LTE",38956,66,-18,-92,-65,-,-,-,-,-
+QENG: "neighbourcell inter","LTE",39154,68,-11,-85,-65,-,-,-,-,-
+QENG: "neighbourcell inter","LTE",39154,179,-20,-93,-65,-,-,-,-,-
OK
AT+QMBNCFG="list"
+QMBNCFG: "List",0,1,1,"ROW_Commercial",0x0A010809,202305221
+QMBNCFG: "List",1,0,0,"TEF_Spain_Commercial",0x0A010C00,202302071
+QMBNCFG: "List",2,0,0,"FirstNet",0x0A015300,202305161
+QMBNCFG: "List",3,0,0,"Rogers_Canada",0x0A014800,202111051
+QMBNCFG: "List",4,0,0,"Bell_Canada",0x0A014700,202111051
+QMBNCFG: "List",5,0,0,"Telus_Canada",0x0A014900,202112271
+QMBNCFG: "List",6,0,0,"Commercial-Sprint",0x0A010204,202111051
+QMBNCFG: "List",7,0,0,"Commercial-TMO",0x0A01050F,202204081
+QMBNCFG: "List",8,0,0,"VoLTE-ATT",0x0A010335,202305161
+QMBNCFG: "List",9,0,0,"CDMAless_Private-Verizon",0x0A01FD28,202212062
+QMBNCFG: "List",10,0,0,"CDMAless-Verizon",0x0A010126,202209281
+QMBNCFG: "List",11,0,0,"Telia_Sweden",0x0A012400,202303301
+QMBNCFG: "List",12,0,0,"TIM_Italy_Commercial",0x0A012B00,202111051
+QMBNCFG: "List",13,0,0,"France-Commercial-Orange",0x0A010B21,202111051
+QMBNCFG: "List",14,0,0,"Commercial-DT-VOLTE",0x0A011F1F,202212061
+QMBNCFG: "List",15,0,0,"Germany-VoLTE-Vodafone",0x0A010449,202111051
+QMBNCFG: "List",16,0,0,"UK-VoLTE-Vodafone",0x0A010426,202111051
+QMBNCFG: "List",17,0,0,"Commercial-EE",0x0A01220B,202303301
+QMBNCFG: "List",18,0,0,"Optus_Australia_Commercial",0x0A014400,202111051
+QMBNCFG: "List",19,0,0,"Telstra_Australia_Commercial",0x0A010F00,202304251
+QMBNCFG: "List",20,0,0,"Commercial-LGU",0x0A012608,202111051
+QMBNCFG: "List",21,0,0,"Commercial-KT",0x0A01280B,202111051
+QMBNCFG: "List",22,0,0,"Commercial-SKT",0x0A01270A,202111051
+QMBNCFG: "List",23,0,0,"Commercial-Reliance",0x0A011B0C,202210211
+QMBNCFG: "List",24,0,0,"Commercial-SBM",0x0A011C0B,202111051
+QMBNCFG: "List",25,0,0,"Commercial-KDDI",0x0A010709,202111051
+QMBNCFG: "List",26,0,0,"Commercial-DCM",0x0A010D0D,202301051
+QMBNCFG: "List",27,0,0,"VoLTE-CU",0x0A011561,202204211
+QMBNCFG: "List",28,0,0,"VoLTE_OPNMKT_CT",0x0A0113E0,202307241
+QMBNCFG: "List",29,0,0,"Volte_OpenMkt-Commercial-CMCC",0x0A012010,202307241
OK
I tried on OpenWRT router and on M.2 adapter 2.5GB
I tried to change the IMEI but also nothing change still I can’t get the NSA 5G bands or 5G Bands at all .also when I scanned nearlly cells
Cell Scanner Start ...
Band : B1 Signal : -36 (dBm) EARFCN : 500 PCI : 36 (current)
Band : B3 Signal : -34 (dBm) EARFCN : 1450 PCI : 120
Band : B3 Signal : -44 (dBm) EARFCN : 1279 PCI : 120
Band : B40 Signal : -65 (dBm) EARFCN : 38956 PCI : 68
Band : B40 Signal : -64 (dBm) EARFCN : 39154 PCI : 68
Band : B40 Signal : -64 (dBm) EARFCN : 39154 PCI : 179
Done
modem doesn’t detect 5G bands …
Note : as I mentioned previously I was able to get NSA 5G on this modem RM521-F but currently I don’t know what happened to it .. in same spot I have RM551 I can get NSA 5G fine without any issue
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Also I tried to reflash the modem with same firmware but no luck still same issue
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Two things came to my mind either the modem defected or antenna ports on the modem defected I’m not sure
I appreciate any advise
