# MC7455 EMM state: Deregistered Attach Needed

**URL:** <https://forum.sierrawireless.com/t/mc7455-emm-state-deregistered-attach-needed/9273>\
**Category:** MC/EM Series\
**Created:** [June 15, 2017, 7:00pm UTC](https://forum.sierrawireless.com/t/mc7455-emm-state-deregistered-attach-needed/9273 "2017-06-15T19:00:29Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![chhowell](https://avatars.discourse-cdn.com/v4/letter/c/3ec8ea/32.png) [@chhowell](https://forum.sierrawireless.com/u/chhowell)\
**Post date:** [June 15, 2017, 7:00pm UTC](https://forum.sierrawireless.com/t/mc7455-emm-state-deregistered-attach-needed/9273/1 "2017-06-15T19:00:29Z")

</div>

I have an mc7455 connected to a usb/sim adapter that suddenly stopped working. Here’s the output of AT!GSTATUS?

Recieve: AT!GSTATUS?  
Recieve: !GSTATUS:  
Recieve: Current Time: 255 Temperature: 26  
Recieve: Reset Counter: 23 Mode: ONLINE  
Recieve: System mode: LTE PS state: Not attached  
Recieve: LTE band: B25 LTE bw: 20 MHz  
Recieve: LTE Rx chan: 8240 LTE Tx chan: 4294967295  
Recieve: LTE CA state: NOT ASSIGNED  
Recieve: EMM state: Deregistered Attach Needed  
Recieve: RRC state: RRC Idle  
Recieve: IMS reg state: No Srv   
Recieve: PCC RxM RSSI: -84 RSRP (dBm): -114  
Recieve: PCC RxD RSSI: -95 RSRP (dBm): -138  
Recieve: Tx Power: 0 TAC: 8D07 (36103)  
Recieve: RSRQ (dB): -10.6 Cell ID: 0A407B0A (171997962)  
Recieve: SINR (dB): 11.8  
Recieve: OK

Note the EMM state as deregistered and Tx power is 0. This occurred without any changes being made other than unplugging and plugging it back in. Is there an AT command to re-attach? Or is this a hardware failure somewhere? Thanks

---

<div class="post-metadata">

**Author:** ![chhowell](https://avatars.discourse-cdn.com/v4/letter/c/3ec8ea/32.png) [@chhowell](https://forum.sierrawireless.com/u/chhowell)\
**Post date:** [June 15, 2017, 8:07pm UTC](https://forum.sierrawireless.com/t/mc7455-emm-state-deregistered-attach-needed/9273/2 "2017-06-15T20:07:49Z")

</div>

I’m also getting this sometimes but it wont complete the attach

Recieve: AT!GSTATUS?  
Recieve: !GSTATUS:  
Recieve: Current Time: 1479 Temperature: 29  
Recieve: Reset Counter: 1 Mode: ONLINE  
Recieve: System mode: LTE PS state: Not attached  
Recieve: LTE band: B25 LTE bw: 5 MHz  
Recieve: LTE Rx chan: 8665 LTE Tx chan: 26665  
Recieve: LTE CA state: NOT ASSIGNED  
Recieve: EMM state: Reg Initiated Waiting for NW  
Recieve: RRC state: Waiting RRC Cfm  
Recieve: IMS reg state: No Srv   
Recieve: PCC RxM RSSI: -98 RSRP (dBm): -131  
Recieve: PCC RxD RSSI: -84 RSRP (dBm): -110  
Recieve: Tx Power: 0 TAC: 5608 (22024)  
Recieve: RSRQ (dB): -12.4 Cell ID: 0AC19C02 (180460546)  
Recieve: SINR (dB): 3.2  
Recieve: OK