BPI-R4 PRO 4E: Micro SD card inage

Banana Pi Router design BPI-R4/BPI-R4 Pro(MT7988)
1

Hi,

About the BPI-R4 PRO 4E package, https://www.bpi-shop.com/products/bpi-r4-pro-complete-assembly-package.html.

  1. If I want to boot from micro SD card which of the images from Banana Pi BPI-R4 Pro Wifi7 Router board design with Mediatek MT7988A | BananaPi Docs shall I burn to an micro SD card? There are three images in there; a. eMMC, b. nnand and c. SD card. I would like to boot directly from the micro SD card slot.
  2. If I want to boot from NVMe drive, which image and what configuration should I use?
  3. Does the factory shipped device already have the correct OpenWRT image flashed on it?