Boron 3rd-party sim card

to insert the 3rd-party sim card it’s have to disconnect battery and usb cable?
I tray to put in the sim card, after this operation my Boron go in listening mode and only with the restore factory i can take alive may Boron.
Thanks Valentino

We recommend powering down a Boron or Electron before changing SIM cards for extra safety. Also, you need to power down completely to reset the modem to recognize the SIM change on the Electron anyway.

However, if you did change the SIM with the power on you should not have damaged the device. Just power it down again (remove battery and USB power), and then use the 3rd-party SIM instructions:

Thanks for your answer I see your post about flashing firmware is also for flashing 3rd-party?