Hk.t.rt2851v09 - Firmware

The string hk.t.rt2851v09 probably indicates:

Common devices using RT2851:

Action: Open your device, check the PCB for model number (e.g., "RT2851" or "FEM-V09"), or look at the sticker underneath for hardware version. hk.t.rt2851v09 firmware

The RT2851 chipset is supported by the rt2800 family of drivers in the Linux kernel. The firmware file is typically named:

You can obtain the official firmware package from: The string hk

sudo apt-get install firmware-ralink   # Debian/Ubuntu
sudo dnf install ralink-firmware       # Fedora

WARNING: Avoid random file-hosting sites (Mediafire, Zippyshare). Many offer malware-laden "firmware updates."

A customized Linux kernel (often version 3.10.x or 3.18.x for this hardware generation). It contains drivers for: Common devices using RT2851:

Instead of hunting for hk.t.rt2851v09, consider building a generic RT2851 image from OpenWrt source:

git clone https://git.openwrt.org/openwrt/openwrt.git
cd openwrt
git checkout v15.05.1  # last stable for ramips/rt288x
make menuconfig
# Select: Target System -> Ralink RT288x/RT3xxx
# Subtarget -> RT3xxx
# Build firmware

But note: wireless may not fully work without vendor calibration data.

| Error Message | Likely Cause | Solution | |---------------|--------------|----------| | rt2800usb: firmware failed to load | Missing /lib/firmware/rt2860.bin | Manually copy firmware file | | Version mismatch. Expected v0.37, got v0.33 | Incompatible firmware version | Use rt2800.bin instead of rt2860.bin | | Direct firmware load for rt2851.bin failed | Wrong filename requested by driver | Create a symlink: ln -s /lib/firmware/rt2860.bin /lib/firmware/rt2851.bin | | Device disappears after update | Power cycle required | Unplug USB or router power for 30 seconds |