<div style="line-height:1.7;color:#000000;font-size:14px;font-family:Arial"><pre><div>Hey,</div><div><br></div><div>Thanks your reply. </div><div><br></div><div>On my test machines, I plugin three MC7354 modem and the details s below:</div><div><br></div><div><div style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 13px; line-height: normal; white-space: normal;">Slot 1: MC7354 - 1102225: VZW Sim, Firmware: 05.05.16.03</div><div style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 13px; line-height: normal; white-space: normal;">Slot 2: MC7354 - 1102016: T-MOBILE SIM Firmware: 05.05.16.02 </div><div style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 13px; line-height: normal; white-space: normal;">Slot 3: MC7354 - 1102016: ATnT Sim Firmware: 05.05.16.02</div></div><div><br></div><div>They work on LTE at the beginning, after run 12 hours, the slot 2 modem will drop to UMTS and always can't back to LTE mode.</div><div><br></div><div>For the modem in slot 2, the output which you mention as below, it work on UMTS now.</div><div><span style="background-color: rgb(128, 128, 128);">tvupack TVUTransporter # qmicli -d /dev/cdc-wdm1 --nas-get-system-selection-preference</span>
[/dev/cdc-wdm1] Successfully got system selection preference
Emergency mode: 'no'
Mode preference: 'cdma-1x, cdma-1xevdo, gsm, umts, lte'
Band preference: 'gsm-dcs-1800, gsm-900-extended, gsm-900-primary, gsm-850, gsm-pcs-1900, wcdma-2100, wcdma-pcs-1900, wcdma-850-us, wcdma-800, wcdma-900'
LTE band preference: '2, 4, 5, 17'
TD-SCDMA band preference: 'a, b, c, d, e, f'
CDMA PRL preference: 'any'
Roaming preference: 'any'
Network selection preference: 'automatic'
Service domain preference: 'cs-ps'
Service selection preference: 'automatic'</div><div><br></div><div><span style="background-color: rgb(128, 128, 128);">tvupack TVUTransporter # qmicli -d /dev/cdc-wdm1 --nas-get-technology-preference</span>
[/dev/cdc-wdm1] Successfully got technology preference
Active: 'auto', duration: 'permanent'</div><div><br></div><div><span style="background-color: rgb(128, 128, 128);">tvupack TVUTransporter # qmicli -d /dev/cdc-wdm1 --nas-get-system-info</span>
[/dev/cdc-wdm1] Successfully got system info:
CDMA 1x service:
Status: 'none'
Preferred data path: 'no'
CDMA 1xEV-DO (HDR) service:
Status: 'power-save'
Preferred data path: 'no'
GSM service:
Status: 'none'
True Status: 'none'
Preferred data path: 'no'
WCDMA service:
Status: 'available'
True Status: 'available'
Preferred data path: 'no'
Domain: 'cs-ps'
Service capability: 'cs-ps'
Roaming status: 'off'
Forbidden: 'no'
Location Area Code: '40495'
Cell ID: '39627181'
MCC: '310'
MNC: '260'
HS call status: '(null)'
HS service: '(null)'
Primary scrambling code: '142'
Cell broadcast support: 'off'
Call barring status (CS): 'all-calls'
Call barring status (PS): 'all-calls'
Cipher Domain: 'ps'
LTE service:
Status: 'none'
True Status: 'none'
Preferred data path: 'no'
SIM reject info: 'vailable'</div><div><br></div><div><span style="background-color: rgb(128, 128, 128);">tvupack TVUTransporter # qmicli -d /dev/cdc-wdm1 --nas-get-serving-system</span>
[/dev/cdc-wdm1] Successfully got serving system:
Registration state: 'registered'
CS: 'attached'
PS: 'attached'
Selected network: '3gpp'
Radio interfaces: '1'
[0]: 'umts'
Roaming status: 'off'
Data service capabilities: '3'
[0]: 'hsdpa'
[1]: 'hsupa'
[2]: 'wcdma'
Current PLMN:
MCC: '310'
MNC: '260'
Description: ''
Roaming indicators: '1'
[0]: 'off' (umts)
3GPP daylight saving time adjustment: '1' hours
3GPP location area code: '40495'
3GPP cell ID: '39627181'
Detailed status:
Status: 'available'
Capability: 'cs-ps'
HDR Status: 'power-save'
HDR Hybrid: 'yes'
Forbidden: 'no'
Call barring status:
Circuit switched: 'all-calls'
Packet switched: 'all-calls'
UMTS primary scrambling code: '142'
Full operator code info:
MCC: '310'
MNC: '260'
MNC with PCS digit: 'yes'</div><div><br></div><div><span style="background-color: rgb(128, 128, 128);">tvupack TVUTransporter # qmicli -d /dev/cdc-wdm1 --nas-get-signal-info</span>
[/dev/cdc-wdm1] Successfully got signal info
HDR:
RSSI: '-125 dBm'
ECIO: '-2.5 dBm'
SINR (8): '9.0 dB'
IO: '-106 dBm'
WCDMA:
RSSI: '-96 dBm'
ECIO: '-6.5 dBm'</div><div><br></div><span style="color: rgb(128, 128, 128);">>However, when you're "locked" to WCDMA, what happens if you run
>--nas-network-scan? Does the modem soon jump back to LTE now that it
</span><div><span style="color: rgb(128, 128, 128);">>has a full network list?</span></div><div><span style="color: rgb(128, 128, 128);"><br></span></div><div><span style="color: rgb(0, 0, 0);">when locked to WCDMA, then run --nas-network-scan:</span></div><div><font color="#808080"><span style="color: rgb(0, 0, 0);">tvupack TVUTransporter # qmicli -d /dev/cdc-wdm1 --nas-network-scan
[/dev/cdc-wdm1] Successfully scanned networks</span></font></div><div><font color="#808080"><span style="color: rgb(0, 0, 0);"><br></span></font></div><div><font color="#808080"><span style="color: rgb(0, 0, 0);">NO available information output, also not jump back to LTE</span></font></div><div><br></div><div>Is there someone encounter this issue?</div><div><br></div>
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