# MangOH Yellow cannot recognize SIMs in slot 1
**URL:** https://mangoh.discourse.group/t/mangoh-yellow-cannot-recognize-sims-in-slot-1/5287
**Category:** mangOH Yellow
**Created:** [September 24, 2020, 7:58am UTC](https://mangoh.discourse.group/t/mangoh-yellow-cannot-recognize-sims-in-slot-1/5287 "2020-09-24T07:58:04Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@elkanamolson](https://mangoh.discourse.group/u/elkanamolson)
#### Post date: [September 24, 2020, 7:58am UTC](https://mangoh.discourse.group/t/mangoh-yellow-cannot-recognize-sims-in-slot-1/5287/1 "2020-09-24T07:58:04Z")
Hi All,
i have Mangoh Yellow that cannot recognize SIM in the external slot, `cm sim` response `SIM card is absent (LE_SIM_ABSENT)`
So, i was tried to update the FW with/without Octave and back to last version of the system without changes, in AT CMD the SIM cannot recognized. if i change it to embedded it recognize and give me the numbers.
I was tried with couple of SIMs and it working well in phones etc.
[yellowSimError.txt](https://mangoh.discourse.group/uploads/short-url/1JTole2WiDMZfbUu968VDz5nlZK.txt) (6.3 KB)
Any advise here?
BR,
ElkanaM
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### Author:  [@jyijyi](https://mangoh.discourse.group/u/jyijyi)
#### Post date: [September 24, 2020, 9:21am UTC](https://mangoh.discourse.group/t/mangoh-yellow-cannot-recognize-sims-in-slot-1/5287/2 "2020-09-24T09:21:11Z")
seems this is hardware problem, some user does not see this issue on mangoh yellow:
> [@APN will recover when mangOH Yellow reboot](https://mangoh.discourse.group/t/apn-will-recover-when-mangoh-yellow-reboot/4830/3):
>
> Hi jyijyi, Thank you for your reply. I know that “at+cgdcont” can set more APN, but I use mangOH red with WP7702, the APN didn’t recover to “iot.swir” when reboot… How can I freeze the first APN on mangOH yellow? Thanks, Albert
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### Author:  [@elkanamolson](https://mangoh.discourse.group/u/elkanamolson)
#### Post date: [September 24, 2020, 8:48pm UTC](https://mangoh.discourse.group/t/mangoh-yellow-cannot-recognize-sims-in-slot-1/5287/3 "2020-09-24T20:48:46Z")
Thanks @jyijyi,
I think isn’t the issue here, the device has recognized the SIMs before and established connection over external SIM, so i think is SW issue.
If i was trying to set the AT!UIMS=1 or 2 it’s feedback ERROR, so something stop the modem to choose with external sim, it managed automatically, not manual.
The FW change i was tried, isn’t helping.
Do you have any way to debug it?
BR,
ElkanaM
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### Author:  [@jyijyi](https://mangoh.discourse.group/u/jyijyi)
#### Post date: [September 24, 2020, 11:03pm UTC](https://mangoh.discourse.group/t/mangoh-yellow-cannot-recognize-sims-in-slot-1/5287/4 "2020-09-24T23:03:50Z")
But in your log, you can do " cm sim select EMBEDDED", but now at!uims=1 returns error, seems not matching each other .
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### Author:  [@elkanamolson](https://mangoh.discourse.group/u/elkanamolson)
#### Post date: [October 5, 2020, 10:43am UTC](https://mangoh.discourse.group/t/mangoh-yellow-cannot-recognize-sims-in-slot-1/5287/5 "2020-10-05T10:43:47Z")
Thnaks @jyijyi after my double check it seems like HW issue, the right inside leg disconnectedd.
thanks for your help, the secound MangOH yellow working well.