# Unable to switch to LTE on MC7700

**URL:** <https://forum.sierrawireless.com/t/unable-to-switch-to-lte-on-mc7700/7866>\
**Category:** MC/EM Series\
**Created:** [April 9, 2015, 6:26pm UTC](https://forum.sierrawireless.com/t/unable-to-switch-to-lte-on-mc7700/7866 "2015-04-09T18:26:19Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![jhohisel](https://avatars.discourse-cdn.com/v4/letter/j/dbc845/32.png) [@jhohisel](https://forum.sierrawireless.com/u/jhohisel)\
**Post date:** [April 9, 2015, 6:26pm UTC](https://forum.sierrawireless.com/t/unable-to-switch-to-lte-on-mc7700/7866/1 "2015-04-09T18:26:19Z")

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I’ve noticed that in areas of LTE coverage, my modem is not using LTE, and only using HSPA+.

My carrier is AT&T (US).

I just updated the firmware to SWI9200X\_03.05.29.03ap (AT&T DIP), but I got the same result with the current and previous versions.

Result of AT!SELRAT=?  
!SELRAT: Index, Name  
00, Automatic  
01, UMTS 3G Only  
02, GSM 2G Only  
03, Automatic  
04, Automatic  
05, GSM and UMTS Only  
06, LTE Only  
07, GSM, UMTS, LTE  
11, UMTS and LTE Only  
12, GSM and LTE Only

Result of AT!SELRAT=6  
ERROR

Result of AT!SELRAT=7  
ERROR

Result of AT!SELRAT=1  
OK

Result of AT!SELRAT=2  
OK

Result of AT!BAND=?  
Index, Name  
00, All bands  
01, Europe 3G  
02, North America 3G  
03, Europe 2G  
04, North America 2G  
05, GSM ALL  
08, WCDMA ALL

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<div class="post-metadata">

**Author:** ![jhohisel](https://avatars.discourse-cdn.com/v4/letter/j/dbc845/32.png) [@jhohisel](https://forum.sierrawireless.com/u/jhohisel)\
**Post date:** [April 14, 2015, 5:54am UTC](https://forum.sierrawireless.com/t/unable-to-switch-to-lte-on-mc7700/7866/2 "2015-04-14T05:54:52Z")

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Finally figured it out!!!

For those who encounter the same issue:

I ran AT!ENTERCND=“A710” for password-protected commands.  
Then AT!NVBACKUP=0 to backup the factory calibration.  
AT!NVDEF to restore default configuration.  
Finally, AT!NVRESTORE=0 to restore factory calibration, and AT!RESET to restart modem.

NOTE!!! All settings will be erased, and have to be reprogrammed!

But, I can finally enable LTE using AT!SELRAT.

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**Author:** ![rplabs](https://avatars.discourse-cdn.com/v4/letter/r/278dde/32.png) [@rplabs](https://forum.sierrawireless.com/u/rplabs)\
**Post date:** [March 2, 2016, 1:56pm UTC](https://forum.sierrawireless.com/t/unable-to-switch-to-lte-on-mc7700/7866/3 "2016-03-02T13:56:54Z")

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Hello,

I used your procedure except the AT!NVRESTORE so I made the RESET by mistake. Now the MC7700 is not detected anymore.

Is there any emergency procedure to fix this issue?

Regards