MangOH Yellow cannot recognize SIMs in slot 1

[jyijyi]

seems this is hardware problem, some user does not see this issue on mangoh yellow:

APN will recover when mangOH Yellow reboot

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