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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). DD-WRT Forum :: View topic - Buffalo WHR-HP-G300N Apr 04, 2010 Firmware FAQ - DD-WRT Wiki Signal Quality: High is good, somewhat like SNR but indexed to 100 with noise as the base, percentage of the best theoretical ideal quality in regards to your local-noise Signal - Noise = SNR -82 - -98 = 16. Signal / Noise * SNR = Signal Quality -82 / -98 * 16 = 13.4% . Typically, noise will be -92 which means you should get a clean connection with a signal as low as -92.
Buffalo WZR-HP-G300NH - Firmware Update to DD-WRT - YouTube
DD-WRT Forum :: View topic - WHR-HP-G300N VPN Jun 05, 2010
User-Friendly firmware (not DD-WRT) version 1.93 for WHR-HP-G300N: Download: 4.03 MB: 2016-04-25: V24-SP2 build 19154: DD-WRT (Professional) firmware for the WHR-HP-G300N: Download: 4.05 MB: 2016-04-25: V24SP2 17798 Alpha: Non-Production, DD-WRT Alpha firmware
WHR-HP-G300N - Firmware Upgrade Problem?