I updated my CPU, Wlan/Bluetooth and USB in my T430 : r/thinkpad
Amazon.com: Lenovo ThinkPad T420 Business Laptop - Windows 10 Pro - Intel Core i5-2520, 256GB SSD, 8GB RAM, 14.0" HD (1366x768) Anti-Glare Display, ThinkLight Keyboard Light, DVD/CD-RW Drive, VGA : Electronics
HELP - Lenovo T420 doesnt have functioning bluetooth, the light never comes on and my computer doesn't show me any bluetooth options. Please help! : r/ Lenovo
Lenovo Thinkpad T420 14" HD LED-Backlit Business Laptop, Intel Core i5-2520M Processor, 2.50GHz up to 3.20GHz, 10GB Memory, 1TB HDD, Webcam, DVD, WiFi, Bluetooth, VGA, Windows 10 (Renewed) : Amazon.in: Electronics
LENOVO T420 WIFI BLUETOOTH Issue - YouTube
Amazon.com: Lenovo ThinkPad T450 14in HD Business Laptop Computer, Intel Dual-Core i5-5300U Up to 2.9GHz, 8GB RAM, 128GB SSD, HDMI, 802.11ac WiFi, Bluetooth, Windows 10 Professional (Renewed) : Electronics
Amazon.com: Lenovo ThinkPad T440 14inch Business Laptop Computer, Intel Core i5-4300U Up to 2.9GHz, 8GB RAM, 256GB SSD, Bluetooth, USB 3.0, Windows 10 Professional (Renewed) : Electronics