Airtel AirFiber AAP4221ZY

abgn+ac+ax (AX1800)
802.11ax (WiFi 6) Dual-Radio PoE Access Point
3rd Party Firmware
dd-wrt	Status Unknown
OpenWrt	Supported
Tomato any flavor	Incompatible
Gargoyle	Status Unknown
Platform
Brand • Model • Rev	Airtel AirFiber AAP4221ZY
FCC ID	I88-03911
Type	access point
CPU1 Y	MediaTek MT7981BA
CPU1 Type	ARM Cortex-A53
CPU1 Speed	1.3 GHz ( 2 cores ) 64-bit
Flash1 Chip	Micron Model?
Flash1 Size	512 MiB536,870,912 B <br />4,194,304 Kib <br />524,288 KiB <br />4,096 Mib <br />0.5 GiB <br /> (SPI NAND)
RAM1 Size	512 MiB536,870,912 B <br />4,194,304 Kib <br />524,288 KiB <br />4,096 Mib <br />0.5 GiB <br /> (DDR3)
RAM1 Chip	Brand? Model?
ETH chip1	MediaTek MT7981BA
Switch	Airoha AN8855
Ethernet Port Count	1-2.5GbE-WAN 2-1GbE-LAN
Wired Standard	IEEE 802.3i/3u/3ab/3bz
802dot11 OUI: none specified
Stock bootloader	U-Boot
Expansion IF types	none specified
Serial Port (UART)	yes, 3.3V TTL, (115200 8N1)
Other
3rd Party Firmware Support	OpenWrt • (List | Dev | DLs)
Radio 1
Chip1	MediaTek MT7981BA
Chip2	MediaTek MT7976
Wireless interface OUI	none specified
Antenna Connector Type	MHF4
MIMO status	2x2:2
Wireless Standard	IEEE 802.11b/g/n/ax
802.11ax	up to 574 Mbps
802.11n	up to 300 Mbps
802.11g	up to 54 Mbps
802.11b	up to 11 Mbps
WiFi Operating Frequency	2.4 GHz
Radio 2
Chip1	MediaTek MT7981BA
Chip2	MediaTek MT7976
Wireless interface OUI	none specified
Antenna Connector Type	MHF4
MIMO status	2x3:2
Wireless Standard	IEEE 802.11a/n/ac/ax
802.11ax	up to 1201 Mbps
802.11ac	up to 867 Mbps
802.11n	up to 300 Mbps
802.11a	up to 54 Mbps
WiFi Operating Frequency	5 GHz

For a list of all currently documented Airoha (EcoNet) chipsets with specifications, see Airoha.
For a list of all currently documented MediaTek chipsets with specifications, see MediaTek.

• 574 Mbps - 2SS 2.4GHz 802.11ax (40MHz chan., 256-QAM),

• 1201 Mbps - 2SS 5GHz 802.11ax (80MHz chan., 1024-QAM) = AX1800 class

Flashing

Flashing OpenWrt

On the OpenWrt ToH (techdata entry)

Target: mediatek
Subtarget: filogic
Package architecture: aarch64_cortex-a53
Supported Since Commit
Support started version: unknown
Current supported version: snapshot

LAN Hardware: Airoha AN8855
LAN Comment: PoE out on WAN Port
WLAN Hardware: MediaTek MT7981BA, MediaTek MT7976
WLAN Comment: 2.4GHz: 2x2:2 MIMO, 5GHz: 2X2:2 MIMO
Installation method(s):
see git-commit
Recovery method(s):
see git-commit
Comment:
Externally accessible console port. Internal photos available via FCC search (not on fcc.io) Grantee Code: I88 Product Code: 03911

git • >>

mediatek: add support for Airtel AirFiber AAP4221ZY The Airtel AirFiber AAP4221ZY is an ISP-provided router that is part of the ISP's Fixed Wireless Access (FWA) solution. The FWA system consists of two units: an outdoor 5G unit and this indoor Wi-Fi router connected via a PoE ethernet link. This commit adds support for the indoor unit. The OEM appears to be Zyxel with model number EX3310-T0, although this is not printed on any label and only found in the vendor firmware DTS, bootlog, and other internal references. Hardware -------- SOC: MediaTek MT7981B CPU: 2 core Cortex-A53 (1300MHz) RAM: 512MB DDR3 FLASH: 512MB SPI-NAND (Micron, 4096 page, 256KiB block) WIFI: MediaTek MT7976 802.11ax 2x2 2.4GHz + 5GHz ETH: Airoha AN8855 GbE Switch (2x LAN) + MT7981 internal GbE PHY (WAN) POE: WAN port provides PoE to the outdoor unit (GPIO 10) UART: 3V3 115200 8N1 Bootloader ---------- The device uses BL2 -> U-Boot -> Zyxel zloader chain. U-Boot has a hardcoded command to always launch zloader (similar to the Zyxel EX5601-T0, see commit 1c05388ab04c). zloader is the Zyxel secondary bootloader which handles dual-boot (ubi/ubi2 A/B scheme), firmware verification, and PoE port enablement. zloader requires a UBI volume named "zyfwinfo" containing a 256-byte metadata structure with a "ZYXE" magic header and a valid checksum. Without this volume, zloader refuses to boot the firmware. The zyfwinfo structure also contains a sequence number (range 0-9999, wraps around) used to select which firmware bank to boot - the bank with the higher sequence number wins. This OpenWrt image sets it to 5555 to always win over stock firmware starting at 0. During sysupgrade, platform.sh refreshes the zyfwinfo volume before writing kernel and rootfs to UBI, as rootfs_data is sized to fill the remaining space. Note that OpenWrt can only be flashed to ubi (mtd6). The zloader appends rootubi=ubi or rootubi=ubi2 to the kernel bootargs based on which partition it selects, but OpenWrt cannot understand this parameter, so the firmware must always reside on the first bank (ubi). UART access ----------- Serial console output is restricted by the U-Boot environment variable EngDebugFlag which is 0x00 by default. Users need to first obtain root access on the vendor firmware and run: fw_setenv EngDebugFlag 0x01 Then reboot. Connect UART and press Enter to enter the zloader shell (ZHAL> prompt). Use the ATGU command to switch to the U-Boot shell. Note: ATGU must be entered twice to get the MT7981> prompt: ZHAL> ATGU [zloader reloads] ZHAL> ATGU MT7981> Installation ------------ 1. Enable UART access as described above. 2. Enter U-Boot shell (ATGU twice from ZHAL> prompt). 3. Load the initramfs image via TFTP: MT7981> setenv ipaddr 192.168.1.1 MT7981> setenv serverip 192.168.1.2 MT7981> tftpboot 0x46000000 openwrt-mediatek-filogic-airtel_aap4221zy-initramfs-kernel.bin MT7981> bootm 0x46000000 4. Once OpenWrt boots from initramfs, transfer and flash the sysupgrade image: sysupgrade -n /tmp/openwrt-mediatek-filogic-airtel_aap4221zy-squashfs-sysupgrade.bin 5. The device will reboot and zloader will boot OpenWrt from flash. Signed-off-by: Ahmed Naseef Link: https://github.com/openwrt/openwrt/pull/22809 Signed-off-by: Jonas Jelonek