Buffalo WHR-G300N V2

This device is NOT RECOMMENDED for future use with OpenWrt due to low flash/ram.
DO NOT BUY DEVICES WITH 4MB FLASH / 32MB RAM if you intend to flash an up-to-date and secure OpenWrt version onto it! See 4/32 warning for details.

1) This device does not have sufficient resources (flash and/or RAM) to provide secure and reliable operation.
This means that even setting a password or changing simple network settings might not be possible any more, rendering the device effectively useless. See OpenWrt on 4/32 devices what you can do now.

2) OpenWrt support for this device has ended in 2022.
19.07.10 was the last official build for 4/32 devices.

Brand	Model	Version	Current Release	OEM Info	Forum Topic	Technical Data
Buffalo	WHR-G300N	v2	19.07.2	https://www.buffalo-technology.com/productview/WHR-G300NV2		View/Edit data

Model	Version	SoC	CPU MHz	Flash MB	RAM MB	WLAN Hardware	WLAN2.4	WLAN5.0	100M ports	Gbit ports	Modem	USB
WHR-G300N	v2	Atheros AR7240	400	4	32	Atheros AR9283	b/g/n	-	5		-	-

Model	Version	Current Release	Firmware OpenWrt Install	Firmware OpenWrt Upgrade
WHR-G300N	v2	19.07.2	https://downloads.openwrt.org/releases/19.07.2/targets/ath79/tiny/openwrt-19.07.2-ath79-tiny-buffalo_whr-g301n-squashfs-factory.bin	https://downloads.openwrt.org/releases/19.07.2/targets/ath79/tiny/openwrt-19.07.2-ath79-tiny-buffalo_whr-g301n-squashfs-sysupgrade.bin

→ Install OpenWrt (generic explanation)

The model name is Buffalo WHR-G300N V2 with the same hardware configuration as WHR-G301 and WHR-HP-G300N. Users can just install the WHR-G301N version firmware as the HW is the same.

Installation works by simply flashing the latest OpenWrt factory image with the original Buffalo firmware (tested in year 2020 with ath79 tiny OpenWrt 19.07.2 image).

WHR-G300N V2 has the TTL serial out on J6(unpopulated 4 pin connector), located near serial flash. Pin 1 is the pin with the square pad, towards the edge of the board with front LEDs.

Pin 1	Pin 2	Pin 3	Pin 4
3.3V	GND	TX	RX

WHR-G300N V2 comes with 32M RAM which is DDR 16bit. The native U-boot can recognize 64M RAM and pass the info to kernel. Unfortunately, the kernel rejected the 64M info and force itself running with 32M RAM. After flashing with OpenWrt, 64M RAM can be fully utilized.

WHR-G300N V2 has no USB support. Since AR7240 has USB 1.1 pins, simply HW mod can add USB support to it.

WHR-G300N V2 has 4M flash which is too small for DIY. After the research, I found it can support 8M and 16M flash with modified TP-Link 841N V5 Bootloader.

How to add tags

AR7240, 4Flash, 32RAM, 5port, FastEthernet, 802.11bgn

ar7240 4Flash 32RAM 5port fastethernet 802.11bgn

Buffalo WHR-G300N V2

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