# Mc7455 auto-sim issue

**URL:** <https://forum.sierrawireless.com/t/mc7455-auto-sim-issue/32002>\
**Category:** MC/EM Series\
**Created:** [April 4, 2024, 9:36am UTC](https://forum.sierrawireless.com/t/mc7455-auto-sim-issue/32002 "2024-04-04T09:36:22Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**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:** [April 4, 2024, 9:47am UTC](https://forum.sierrawireless.com/t/mc7455-auto-sim-issue/32002/2 "2024-04-04T09:47:20Z")

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Do these help?

> [@Auto switching of the firmware based on the SIM operator](https://forum.sierrawireless.com/t/auto-switching-of-the-firmware-based-on-the-sim-operator/21294/2):
>
> @akn So I have attached an example of switching to a different firmware image manually [EM7565 multi image update and image switch.txt](https://forum.sierrawireless.com/uploads/short-url/xaR6ZGdQLvCaQlf1yrhpjJz13U4.txt) (12.0 KB) , its for an EM7565 but the principle and commands are the same as for the 74. The auto SIM switching does work if faced with known MCC/MNC combinations on the SIM IMSI but operators have a lot of different ones so we cannot take all of them into account as there is no way to find out what they are i.e. AT&T have different MCC/MNC combinations for the …

> [@How to change carrier (e.g. DOCOMO =\> SOFTBANK) with out rebooting WP76xx?](https://forum.sierrawireless.com/t/how-to-change-carrier-e-g-docomo-softbank-with-out-rebooting-wp76xx/25492):
>
> Hi, We are using wp7605 and we know that there are dedicated firmware for each carrier such as DOCOMO. Is it possible to change carrier (e.g. DOCOMO =\> SOFTBANK) without rebooting wp7605? We want to support multi carriers on one firmware. Thanks in advance for your advice.

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