EM7455 firmware and PRI slots

Hi, I have a EM7455 running on my Linux ARM board. It comes preloaded with 2 firmware images plus 5 PRI files (ATT, Generic, Sprint, OEMPRI918 and Verizon).

  1. Does the modem automatically selects with PRI file to use depending on the inserted SIM card?
  2. What is the AT command to use to select which firmware image to boot on the next reboot?
  3. Is there a AT command to select which PRI file to use?

Right now I am using the fwdwl-litearm tool to do firmware and PRI updates. I always update as a pair of files. I am just wondering if there is any AT command to manually select a different firmware and/or PRI file to use.