Here is a script that does all the steps of Aeolun.
Also Driver is downloaded and copied, like Laion described.
(I am just learning to bash script and I tried this and thougth I share.)
#!/bin/bash
# Initialization
FIX_UB_500_BT_Stick () {
echo -e "This Script is intended to fix the not working BT Stick UB 500 by TP-Link"
echo -e ""
echo -e "As descrbed in https://askubuntu.com/questions/1370663/bluetooth-scan-doesnt-detect-any-device-on-ubuntu-21-10"
echo -e ""
echo -e "This scripts guides you through all necessary steps. However, please take care. This can break your system, or at least break your bluetooth."
echo -e ""
echo -e "\033[33mStep 1: Download and extract Linux kernel source file."
echo -e "\033[0m"
echo -e ""
echo -e "Your Kernel-Version: "
version=$(uname -r)
echo $version
echo -e "If not 5.13, change script and restart! (Just search and replace 5.13 with your Version, as long as it is a 5.x)"
read -n 1 -p "Do you want to continue? [y/n]" start
if [ "$start" = "y" ] ; then
cd /home/max/
mkdir FIX_UB_500_BT_Stick
cd FIX_UB_500_BT_Stick
wget https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.13.tar.xz
tar xpvf linux-5.13.tar.xz
echo -e "\033[33mDownload location and files:"
echo -e "\033[0m"
pwd
ls
echo -e "\033[33mLocation of files to be changed:"
echo -e "\033[0m"
cd linux-5.13/drivers/bluetooth
pwd
echo -e "\033[33mStep 2: Edit btusb.c"
echo -e "\033[31m"
echo "Add:"
echo -e "\033[0m"
echo "/* Tp-Link UB500 */"
echo "{ USB_DEVICE(0x2357, 0x0604), .driver_info = BTUSB_REALTEK },"
echo -e "\033[33m"
echo "Under the section"
echo -e "\033[0m"
echo "static const struct usb_device_id blacklist_table[]"
echo -e "\033[33m"
echo "After"
echo -e "\033[0m"
echo "/* Silicon Wave based devices */"
echo -e "\033[33m"
echo "in btusb.c"
echo ""
echo "It should look something like this:"
echo -e "\033[0m"
echo "/* Silicon Wave based devices */"
echo "{ USB_DEVICE(0x0c10, 0x0000), .driver_info = BTUSB_SWAVE },"
echo "/* Tp-Link UB500 */"
echo "{ USB_DEVICE(0x2357, 0x0604), .driver_info = BTUSB_REALTEK }, "
echo "{ }/* Terminating entry */"
echo ""
echo -e "\033[31m Safe and close KWrite."
sleep 5
kwrite btusb.c
read -n 1 -p "Did you change the file and want to continue? [y/n]" filechange1
if [ "$filechange1" = "y" ]; then
echo -e "\033[33m"
echo "Ok, continuing."
echo -e "\033[0m"
elif [ "$filechange1" = "n" ];then
sudo rm -r /home/max/FIX_UB_500_BT_Stick
exit
else
echo -e "\033[31mDid you change the file and want to continue? [y/n]; Press ctrl+c to abort."
echo -e "\033[0m"
read -n 1
fi
echo -e "\033[33mStep 3: Edit hci_ldisc.c"
echo -e "\033[0m"
echo -e ""
File="hci_ldisc.c"
if grep -q "void **cookie, unsigned long offset)" "$File"; then
echo -e "\033[33mStep not necessary. File already correct."
echo -e "\033[0m"
else
echo -e "\033[33mChange:"
echo -e "\033[0m"
echo "static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file,"
echo " unsigned char __user *buf, size_t nr)"
echo ""
echo -e "\033[33minto"
echo -e "\033[0m"
echo "static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file,"
echo " unsigned char __user *buf, size_t nr, "
echo " void **cookie, unsigned long offset) "
echo -e "\033[33m"
echo "in hci_ldisc.c"
echo ""
echo "Safe and Close KWrite. (This step might not be necessary for some versions)"
sleep 5
kwrite hci_ldisc.c
read -n 1 -p "Did you change the file and want to continue? [y/n]" filechange2
if [ "$filechange2" = "y" ]; then
echo -e "\033[33m"
echo "Ok, continuing."
echo -e "\033[0m"
elif [ "$filechange2" = "n" ];then
sudo rm -r /home/max/FIX_UB_500_BT_Stick
exit
else
echo -e "\033[31mDid you change the file and want to continue? [y/n];"
read -n 1
fi
fi
echo -e "\033[33mStep 4: Compile modules."
echo -e "\033[0m"
make -C /lib/modules/$(uname -r)/build M=$(pwd) clean
echo -e "\033[33mMake 1 done."
echo -e "\033[0m"
cp /usr/src/linux-headers-$(uname -r)/.config ./
cp /usr/src/linux-headers-$(uname -r)/Module.symvers Module.symvers
make -C /lib/modules/$(uname -r)/build M=$(pwd) modules
echo -e "\033[33mMake 2 done."
echo -e "\033[33mStep 5: Replace the old module."
echo -e "\033[0m"
sudo cp btusb.ko /lib/modules/$(uname -r)/kernel/drivers/bluetooth
echo -e "\033[33mCopied to current Kernel"
echo -e ""
echo -e "\033[33mStep 6: Load new btusb."
echo -e "\033[0m"
sudo modprobe -r btusb
sudo modprobe -v btusb
echo -e "\033[33mModprobe done"
echo -e "\033[0m"
if [[ ! -f "/lib/firmware/rtl_bt/rtl8761b_fw.bin" ]]
then
echo -e "\033[33mStep 7: Download Firmware for UB500 from Realteks GIT."
read -n 1 -p "The FW for the UB500 BT-Dongle is not present in /lib/firmware/rtl_bt/. /n Do you wish to download the file from Realteks Git and copy it to your system? [y/n]" FW_Install
if [ "$FW_Install" = "y" ]; then
echo -e "\033[33m"
echo "Ok, continuing."
echo -e "\033[0m"
cd /home/max/FIX_UB_500_BT_Stick
mkdir FW
cd FW
wget https://github.com/Realtek-OpenSource/android_hardware_realtek/raw/rtk1395/bt/rtkbt/Firmware/BT/rtl8761b_fw
sudo cp /home/max/FIX_UB_500_BT_Stick/FW/rtl8761b_fw /lib/firmware/rtl_bt/rtl8761b_fw.bin
if [[ -f "/lib/firmware/rtl_bt/rtl8761b_fw.bin" ]]; then
echo -e "\033[33mFW was successfully copied. Reboot and try your bluetooth stick. It should work now."
else
echo -e "\033[33mSomething went wrong.You will have to download the FW yourself and place it in the folder /lib/firmware/rtl_bt/ with the name rtl8761b_fw.bin /n You'll find the file in this Repo: https://github.com/Realtek-OpenSource/android_hardware_realtek/raw/rtk1395/bt/rtkbt/Firmware/BT/rtl8761b_config /n If you placed the file there, reboot and your UB500 should work now."
fi
elif [ "$fFW_Install" = "n" ];then
sudo rm -r /home/max/FIX_UB_500_BT_Stick
echo -e "\033[33mFW was not downloaded. You will have to download the FW yourself and place it in the folder /lib/firmware/rtl_bt/ with the name rtl8761b_fw.bin /n You'll find the file in this Repo: https://github.com/Realtek-OpenSource/android_hardware_realtek/raw/rtk1395/bt/rtkbt/Firmware/BT/rtl8761b_config /n If you placed the file there, reboot and your UB500 should work now."
echo -e "\033[0m"
exit
else
echo -e "\033[31mDownload the FW? [y/n];"
read -n 1
fi
else
echo -e "\033[33mIt looks like, /lib/firmware/rtl_bt/rtl8761b_fw.bin already exists. No further steps needed. Reboot and try your UB500 BT-Stick."
fi
sudo rm -r /home/max/FIX_UB_500_BT_Stick
echo -e "\033[33mDeleted downloaded files and dircetory /home/max/FIX_UB_500_BT_Stick"
echo -e "\033[0m"
elif [ "$start" = "n" ];then
sudo rm -r /home/max/FIX_UB_500_BT_Stick
exit
else
echo -e "\033[33mYou have entered an invallid selection!"
echo -e "\033[33mPlease try again!"
echo -e ""
echo -e "\033[31mPress any key to continue..."
read -n 1
fi
}
FIX_UB_500_BT_Stick
In Step 3 sadly the check in hci_ldisc.c does not work. So you have to check manually.
It uses kwrite as texteditor.
Do not run script as sudo. Wait for it to ask you for sudo.
If you are like myself new to all of it:
For this to work, create a textfile but use extension .sh not .txt
Copy all the code in it and safe.
In your directory open a terminal.
chmod a+x YOURFILE.sh
bash YOURFILE.sh
Follow instructions precisely.
I edited my answer quite a lot, so it is more helpfull.
