Banana Pi BPI-R4: no Wi-Fi on the board, a 19 V supply for the Wi-Fi 7 card, and the 8 GB RAM trapwarning · unverified · The BPI-R4 (MT7988A) brings Wi-Fi through miniPCIe cards, not onboard radios. OpenWrt's device page says the optional Wi-Fi 7 card needs a 19 V / 3.2 A supply and a switch set before installation, and that a 4 GB image limits 8 GB boards to 4 GB unless a compatible BL2 bootloader is used.