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:
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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?
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at!selrat?
!SELRAT: 00, Automatic
OK
Is your sim card for lte network
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Iām 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?
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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?
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at!band?
Index, Name
00, All bands
OK
Did you connect antenna?
How about at+csq
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at+csq
+csq: 99,99
OK
no . based on u tube video Iām just inserted the module in slot under the keyboard of Lenovo P50
if Antenna is required i will buy an antenna!
i can use wlan antenna for em7455?
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
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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?
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ss
AT+CFUN?
+CFUN: 0
OK