hello
i have a P50 lenovo Laptop and EM7455 installed
i have this error
device manager :
you need to enable the modem port for AT command for further investigation:
Finally after war with covid19 i m changed OS and now i can run AT command 
AT!GSTATUS?
!GSTATUS:
Current Time: 683Temperature: 43
Reset Counter: 4Mode: ONLINE
System mode: WCDMA PS state: Not attached
WCDMA band: WCDMA BC3
WCDMA channel: 1294
GMM (PS) state:DEREGISTERED PLMN SEARCH
MM (CS) state: IDLE PLMN SEARCH
WCDMA L1 state:L1M_ACQ LAC: 0000 (0)
RRC state: DISCONNECTED UTRAN Cell ID: 00000000 (0)
RxM RSSI C0: --- RxD RSSI C0: ---
RxM RSSI C1: --- RxD RSSI C1: ---
OK
AT!impref?
!IMPREF:
preferred fw version: 02.33.03.00
preferred carrier name: GENERIC
preferred config name: GENERIC_002.072_000
preferred subpri index: 000
current fw version: 02.33.03.00
current carrier name: GENERIC
current config name: GENERIC_002.072_000
current subpri index: 000
OK
Found Applications port COM7
Found Diagnostics port COM6
Found modem : EM7455
IMEI : ****
Serial NR. : LF70840*****
Firmware : SWI9X30C_02.33.03.00
Voice feature : disabled
SIM Lock status : unlocked
Why it is not in lte mode?
How about at!selrat?
at!selrat?
!SELRAT: 00, Automatic
OK
Is your sim card for lte network
I’m tested 3 kind of sim available in iran
MTN sim
TD-LTE sim
4G sim
in all of them i Have No Service erorr
How about sending at!band?
at!band=?
Index, Name
00, All bands
01, Europe 3G
02, North America 3G
06, Europe
07, North America
08, WCDMA ALL
09, LTE ALL
OK
How about sending at!band?
at!band?
Index, Name
00, All bands
OK
Did you connect antenna?
How about at+csq
at+csq
+csq: 99,99
OK
Seems there is no signal received
No service means No Signal ?
i will buy an antenna! 
if it registers network, +CSQ should return some value:
ati3
Manufacturer: Sierra Wireless, Incorporated
Model: MC7430
Revision: SWI9X30C_02.36.00.00 r8395 CARMD-EV-FRMWR2 2020/10/28 06:33:51
MEID: 35907406009754
IMEI: 359074060097542
IMEI SV: 22
FSN: LU626300170410
+GCAP: +CGSM
OK
at!gstatus?
!GSTATUS:
Current Time: 1603066 Temperature: 30
Reset Counter: 1 Mode: ONLINE
System mode: LTE PS state: Attached
LTE band: B7 LTE bw: 20 MHz
LTE Rx chan: 3150 LTE Tx chan: 19385
LTE CA state: NOT ASSIGNED
EMM state: Registered Normal Service
RRC state: RRC Idle
IMS reg state: No Srv
PCC RxM RSSI: -67 RSRP (dBm): -93
PCC RxD RSSI: -95 RSRP (dBm): -126
Tx Power: -- TAC: 0462 (1122)
RSRQ (dB): -5.5 Cell ID: 04A5410D (77938957)
SINR (dB): 25.4
OK
at+csq
+csq: 23,99
OK
i m connected en external antenna from another Lenovo laptop and its is worked for few minute (antenna percentage 20%) 
but after restart module is turned off and cant be turned on
!GSTATUS:
Current Time: 1057Temperature: 40
Reset Counter: 2Mode: LOW POWER MODE
OK
How to diable Low Power Mode ?
at!pcinfo?
State: Low Power Mode
LPM voters - Temp:0, Volt:0, User:0, W_DISABLE:1, IMSWITCH:0, BIOS:0, LWM2M:0, OMADM:0, FOTA:0
LPM persistence - None
OK
AT+CFUN?
+CFUN: 0
OK
edited
what is the response of AT+CFUN?
ss
AT+CFUN?
+CFUN: 0
OK