Hello,
I see.
On the v4.8 firmware, we did remove the APN profile saved list, but as long as you fill in the APN profile(s) and apply it, this APN will be recorded/save in the background of the router, the router will automatically apply the corresponding Profile for SIM, until you manually reset firmware.
That is to say, when using SIM A, manually enter Profile A and apply in the first time; switch to SIM B, manually enter Profile B and apply in the first time; when you switch to SIM A, the router will automatically apply Profile A to SIM A by recognizing the ICCID of SIM and reading the previously saved Profile A in the background, without manually entering it again. And the same as SIM B.