PC Engines APU 3

The PC Engines APU3 boards are very similar to the APU2 boards, but they are designed to use two 3G / LTE modems, so the first two Mini PCIe slots have USB connection and are connected to the two SIM slots, and only the Mini pcie slot on the left has PCie interface.
So in layman terms you can only install 3G/LTE/5G modem cards in the first two slots and a wifi card in the third slot.

The board also has two SIM slots with hardware switching (OpenWrt support for the switch unknown).

Most information about APU3 is the same as APU2 so you can probably look at the article about APU2 boards

There have been reports that “old” SD cards with the 18.06.1 squashfs image are not recognized as bootable, though the ext4 image on the same card boots.

2018-09 -- https://forum.openwrt.org/t/sd-install-on-apu-2c2/21584

Brand	↓ Model	Current Release	OEM Info	Technical Data
PC Engines	APU3A2	23.05.0	http://www.pcengines.ch/apu3a2.htm	View/Edit data
PC Engines	APU3C2	23.05.0	http://pcengines.ch/apu3c2.htm	View/Edit data
PC Engines	APU3C4	23.05.0	http://pcengines.ch/apu3c4.htm	View/Edit data

Full support since LEDE-17.01.4

↓ Model	SoC	Cores	CPU MHz	Flash MB	RAM MB	NICs	USB
APU3A2	AMD GX-412TC	4	1000	SD	2048	3 Intel i211AT	2x 3.0
APU3C2	AMD GX-412TC	4	1000	SD	2048	3 Intel i211AT	2x 3.0
APU3C4	AMD GX-412TC	4	1000	SD	4096	3 Intel i211AT	2x 3.0

↓ Model	Current Release	Firmware OpenWrt Install	Firmware OpenWrt Upgrade
APU3A2	23.05.0	https://downloads.openwrt.org/releases/23.05.0/targets/x86/64/openwrt-23.05.0-x86-64-generic-squashfs-combined.img.gz	https://downloads.openwrt.org/releases/23.05.0/targets/x86/64/openwrt-23.05.0-x86-64-generic-squashfs-combined.img.gz
APU3C2	23.05.0	https://downloads.openwrt.org/releases/23.05.0/targets/x86/64/openwrt-23.05.0-x86-64-generic-squashfs-combined.img.gz	https://downloads.openwrt.org/releases/23.05.0/targets/x86/64/openwrt-23.05.0-x86-64-generic-squashfs-combined.img.gz
APU3C4	23.05.0	https://downloads.openwrt.org/releases/23.05.0/targets/x86/64/openwrt-23.05.0-x86-64-generic-squashfs-combined.img.gz	https://downloads.openwrt.org/releases/23.05.0/targets/x86/64/openwrt-23.05.0-x86-64-generic-squashfs-combined.img.gz

See PC Engines APU 2 for installation instructions.

PC Engines schematics: APU3A, APU3C
Intel NIC Datasheet: i211AT

The onboard BIOS can be upgraded to a more recent version, see the generic article for PC Engines APUs here

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PC Engines APU 3

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