# MC7455 no registration after firmware update **URL:** \ **Category:** MC/EM Series\ **Created:** [October 27, 2021, 2:15am UTC](https://forum.sierrawireless.com/t/mc7455-no-registration-after-firmware-update/25350 "2021-10-27T02:15:26Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![karol.puszko](https://avatars.discourse-cdn.com/v4/letter/k/c89c15/32.png) [@karol.puszko](https://forum.sierrawireless.com/u/karol.puszko)\ **Post date:** [October 27, 2021, 2:15am UTC](https://forum.sierrawireless.com/t/mc7455-no-registration-after-firmware-update/25350/1 "2021-10-27T02:15:26Z")
Hello. I have problem with two MC7455’s after firmware update. I used that script: [DewaPoker | Situs QQ Poker Online Terbaik & Terpercaya di Indonesia](https://ltehacks.com/viewtopic.php?t=72) After update modem lost IMEI so I used method from that post to recover IMEI: [https://ltehacks.com/viewtopic.php?p=4795&sid=002b02fac6f9c1c51033bb92cb27850d#p4795](https://ltehacks.com/viewtopic.php?p=4795&sid=002b02fac6f9c1c51033bb92cb27850d#p4795) I also tried to flash firmware manually by qmi-firmware update, I tried also with .exe from Sierra on windows. Now, situation with both modems are pretty similar. Modem with recovered IMEI don’t want to register in network, also signal quality is 0% and ONLY gsm-umts is supported. Modem only after update changed supported modes from gsm-umts, lte to gsm-umts what is strange. What I noticed, when I want to set AT!SELRAT=06, AT answer is ERROR. Logs from both Sierras: ## [code]mmcli -m 3 ## General | path: /org/freedesktop/ModemManager1/Modem/3 | device id: ba39a52a627c7a7b02f5c469f06ae6f570cb45e3 ## Hardware | manufacturer: Sierra Wireless, Incorporated | model: MC7455 | firmware revision: SWI9X30C\_02.33.03.00 | carrier config: default | h/w revision: MC7455 | supported: gsm-umts | current: gsm-umts | equipment id: 359072065791622 ## System | device: /sys/devices/pci0000:00/0000:00:14.0/usb3/3-7 | drivers: cdc\_mbim, qcserial | plugin: sierra | primary port: cdc-wdm1 | ports: cdc-wdm1 (mbim), ttyUSB0 (qcdm), ttyUSB1 (gps), | ttyUSB2 (at), wwan0 (net) ## Status | unlock retries: sim-pin2 (3) | state: searching | power state: on | signal quality: 0% (cached) ## Modes | supported: allowed: 3g; preferred: none | current: allowed: 3g; preferred: none ## Bands | supported: utran-1, utran-3, utran-4, utran-5, utran-8, utran-2 | current: utran-1, utran-3, utran-4, utran-5, utran-8, utran-2 ## IP | supported: ipv4, ipv6, ipv4v6 ## 3GPP | imei: 359072065791622 | enabled locks: fixed-dialing | registration: searching ## 3GPP EPS | ue mode of operation: csps-2 SIM | primary sim path: /org/freedesktop/ModemManager1/SIM/2 [/code] ```auto ATI Manufacturer: Sierra Wireless, Incorporated Model: MC7455 Revision: SWI9X30C_02.33.03.00 r8209 CARMD-EV-FRMWR2 2019/08/28 20:59:30 ESN: 12807520841, 8072C249 IMEI: 359072065791622 IMEI SV: 20 FSN: LQ933105050310 +GCAP: +CGSM ``` ```auto 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 ``` ```auto AT!GSTATUS? !GSTATUS: Current Time: 986 Temperature: 30 Reset Counter: 1 Mode: ONLINE System mode: WCDMA PS state: Not attached WCDMA band: WCDMA 1700 WCDMA channel: 1962 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: 02C53D9E (46480798) RxM RSSI C0: --- RxD RSSI C0: --- RxM RSSI C1: --- RxD RSSI C1: --- ``` ```auto AT!ENTERCND="A710" OK AT!SELRAT=06 ERROR ``` ```auto AT!BAND? Index, Name, GW Band Mask L Band Mask TDS Band Mask 00, All bands, 0002000007C00000 00000100330818DF 0000000000000000 ``` Second piece after firmware update: ```auto -------------------------------- General | path: /org/freedesktop/ModemManager1/Modem/0 | device id: 23d5a0b50fca7cf994a2f2625b3e009b829c0798 -------------------------------- Hardware | manufacturer: Sierra Wireless, Incorporated | model: MC7455 | firmware revision: SWI9X30C_02.30.01.01 r7792 CARMD-EV-FRMWR2 2018/07/13 02:24:52 | carrier config: default | h/w revision: 1.0 | supported: gsm-umts | current: gsm-umts | equipment id: 359072065789592 -------------------------------- System | device: /sys/devices/pci0000:00/0000:00:14.0/usb3/3-7 | drivers: qcserial, qmi_wwan | plugin: sierra | primary port: cdc-wdm1 | ports: cdc-wdm1 (qmi), ttyUSB0 (qcdm), ttyUSB1 (gps), | ttyUSB2 (at), wwan0 (net) -------------------------------- Status | lock: sim-pin2 | unlock retries: sim-pin (3), sim-puk (10), sim-pin2 (3), sim-puk2 (10) | state: enabled | power state: on | signal quality: 0% (cached) -------------------------------- Modes | supported: allowed: 3g; preferred: none | current: allowed: 3g; preferred: none -------------------------------- Bands | supported: utran-1, utran-3, utran-4, utran-5, utran-8, utran-2 | current: utran-1, utran-3, utran-4, utran-5, utran-8, utran-2 -------------------------------- IP | supported: ipv4, ipv6, ipv4v6 -------------------------------- 3GPP | imei: 359072065789592 | enabled locks: fixed-dialing | operator id: 26003 | registration: idle -------------------------------- 3GPP EPS | ue mode of operation: csps-2 -------------------------------- SIM | primary sim path: /org/freedesktop/ModemManager1/SIM/0 | sim slot paths: slot 1: /org/freedesktop/ModemManager1/SIM/0 (active) | slot 2: none ``` ```auto ati Manufacturer: Sierra Wireless, Incorporated Model: MC7455 Revision: SWI9X30C_02.30.01.01 r7792 CARMD-EV-FRMWR2 2018/07/13 02:24:52 MEID: 35907206578959 IMEI: 359072065789592 IMEI SV: 16 FSN: LQ904605240310 +GCAP: +CGSM ``` ```auto AT!IMPREF? !IMPREF: preferred fw version: 02.30.01.01 preferred carrier name: GENERIC preferred config name: GENERIC_002.045_001 current fw version: 02.30.01.01 current carrier name: GENERIC current config name: GENERIC_002.045_001 ``` ```auto AT!GSTATUS? !GSTATUS: Current Time: 198 Temperature: 31 Reset Counter: 1 Mode: ONLINE System mode: WCDMA PS state: Not attached WCDMA band: WCDMA 2100 WCDMA channel: 10762 MM (CS) state: IDLE UPDATING WCDMA L1 state:L1M_PCH_SLEEP LAC: 0000 (0) RRC state: DISCONNECTED UTRAN Cell ID: 0C80BD14 (209763604) RxM RSSI C0: -60 RxD RSSI C0: --- RxM RSSI C1: --- RxD RSSI C1: --- ``` ```auto AT!ENTERCND="A710" OK AT!SELRAT=06 ERROR ``` ```auto AT!BAND? Index, Name, GW Band Mask L Band Mask TDS Band Mask 00, All bands, 0002000007C00000 00000100330818DF 0000000000000000 ``` I tried also AT!RMARESET=01 but without any change. Of course antenna is ok, on another modems works fine. Maybe someone knows what’s the problem is? EDIT: I reflashed first modem with FW version that came from the factory. Now registration in network is okay but still no connection. On both modules I have: ```auto AT+COPS=? +COPS: (1,"Orange PL","Orange","26003",2),(1,"T-Mobile.pl","TM PL","26002",2),(1,"Plus","PLUS","26001",2),(1,"Play","Play","26006",2),,(0,1,2,3,4),(0,1,2) OK AT+COPS=1,2,"26003" +CME ERROR: 30 AT+CSQ +CSQ: 26,99 ``` ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [October 27, 2021, 2:33am UTC](https://forum.sierrawireless.com/t/mc7455-no-registration-after-firmware-update/25350/2 "2021-10-27T02:33:48Z")
have you tried the latest FW? Have you set up correctly for the APN by AT+CGDCONT? What is the return of “AT!SELART=?” ---
**Author:** ![karol.puszko](https://avatars.discourse-cdn.com/v4/letter/k/c89c15/32.png) [@karol.puszko](https://forum.sierrawireless.com/u/karol.puszko)\ **Post date:** [October 27, 2021, 5:02am UTC](https://forum.sierrawireless.com/t/mc7455-no-registration-after-firmware-update/25350/3 "2021-10-27T05:02:51Z")
Yes, I tried. After flashing to latest FW problems has become. Now I can’t connect even after return to original FW (SWI9X30C\_02.24.05.06). Unfortunately, I have Rev A modules. I tried to connect by ModemManager on Ubuntu / Debian, but yes, I also tried to manually connect to the network. ```auto AT+CGDCONT=1,"IP","internet" OK AT+CGDCONT? +CGDCONT: 1,"IP","internet","0.0.0.0",0,0,0,0 OK AT!GSTATUS? !GSTATUS: Current Time: 50638 Temperature: 24 Reset Counter: 8 Mode: ONLINE System mode: WCDMA PS state: Not attached WCDMA band: WCDMA 900 WCDMA channel: 3082 GMM (PS) state:DEREGISTERED ATTEMPTING ATT MM (CS) state: IDLE UPDATING WCDMA L1 state:L1M_PCH_SLEEP LAC: E196 (57750) RRC state: DISCONNECTED Cell ID: 02C5346C (46478444) RxM RSSI C0: -53 RxD RSSI C0: --- RxM RSSI C1: --- RxD RSSI C1: --- OK AT!SELRAT=? !SELRAT: Index, Name 00, Automatic 01, UMTS 3G Only 02, Not Supported 03, Not Supported 04, Not Supported 05, Not Supported 06, LTE Only 07, Not Supported 08, Not Supported 09, Not Supported 0A, Not Supported 0B, Not Supported 0C, Not Supported 0D, Not Supported 0E, Not Supported 0F, Not Supported 10, Not Supported 11, UMTS and LTE Only 12, Not Supported 13, Not Supported 14, Not Supported OK ```