I wanted to test access to SIM1 and SIM2 of a new EM7590 (FW 01.01.06.00). SIM1 ok, SIM2 no access, AT+CPIN? says “CME ERROR: SIM busy”.
Verified with AT!CUSTOM? that UIM2ENABLE=1, switched to SIM2 with AT!UIMS=1.
Updated Firmware to latest 01.01.07.00, did not change.
Testplatform Techship adapter MU201, same on own platform with M.2 key B socket.
Same test passes ok for both SIM slots with EM7455 and EM7565.
Is this an internal restriction of the EM7590?
Thanks for any help!
Yes, I have installed the latest drivers 7590.1008.000 from the Sierrawireless website.
It does not depend on the SIM, we tried several. It even happens when there is no SIM in the second slot: “SIM busy” instead of “SIM not inserted”.
The AT+CCID command returns “Error”, it is not listet in the EM7590 AT Command Reference Doc, so I guess it is not supported.
We are using the Techship adapter MU201 as well as our own platform. Both show the same behaviour, with Windows 11 and also with Linux Ubuntu 22.04 LTS. We do not have a Sierra board.
Does the EM7590 has something internal connected to the second SIM interface?
As I explained, we do not have a Sierra board available. But the issue is not dependent on the carrier board. The EM7455 and EM7565 can operate the second SIM without any problem on the same carrier board. It is an internal issue of the EM7590 only.
Do you have an EM7590 to verify the issue?
I don’t have any EM7590 so I could be wrong., but I believe this is as documented in the PTS. Isn’t it? At least it is in the revision I had laying around. The UIM2 pins are used for mmWave antenna management on the EM9190, and I assume the pins therefore are reserved on the EM7590 and EM9191 too.
The documented SIM2 option is an optional eSIM on these modules.
In case you test on the same board, the test passes with both the EM7455 module and the EM7565 module, but the test fails with the EM7590 module. So, I think it’s better to raise this kind of issue via email tech support: firstname.lastname@example.org for further deeper support.
Sierra Wireless says: “The first PV samples have been populated with a consumer eSIM, which prevents using SIM2. For SKU 1105039 MP orders, the eSIM will be depopulated, so external SIM can be used on SIM2 interface.”
Unfortunately also the first 1105039 MP order we just received behaves the same…