In May 2012, CSR acquired Direct Digital Feedback Amplifier (DDFA) technology, a proprietary, highly scalable digital Class-D audio amplifier technology. In February 2011, CSR announced it was merging with Zoran, a video and imaging technology company. In July 2010, CSR announced the acquisition of Belfast-based APT Licensing Ltd. In February 2009, CSR announced it was merging with SiRF, the biggest global supplier of GPS chips, in a share deal worth $136 million. In 2007, CSR acquired Nordnav, a Swedish-based GPS software company, and CPS, a Cambridge-based GPS software company producing Enhanced GPS in partnership with Motorola. In 2005 CSR also acquired the 3G wireless (WCDMA/UMTS/HSDPA) technology company UbiNetics. In 2005 the company acquired Clarity Technologies, a leading Clear Voice Capture (CVC) business. It was first listed on the London Stock Exchange in 2004.

The founding directors, who were all at Cambridge Consultants at the time were Phil O'Donovan, James Collier and Glenn Collinson. The company was founded in 1998 and split away from Cambridge Consultants as Cambridge Silicon Radio or CSR in 1999. CSR was listed on the London Stock Exchange and was a constituent of the FTSE 250 Index. Its main products were connectivity, audio, imaging and location chips. So I just want to return to before I installed CSR Harmony Wireless Software Stack, I'm thinking I have to do restore point on windows 10 to earlier date.CSR plc (formerly Cambridge Silicon Radio) was a multinational fabless semiconductor company headquartered in Cambridge, United Kingdom. Also I have tried setting CSR_BTPORT_01 as generic bluetooth adapter but gives This Device Cannot Start (Code 10). I have tried letting windows update search for updated drivers through update driver in Device Manager but Windows cannot find drivers for your device. In device manager it is under Other Devices as CSR_BTPORT_01, I tried reinstalling using CSR Harmony Wireless Software Stack but it says the CSR Harmony Wireless Software Stack.msi is missing, and search for it but it cannot be found. Then once installed it lost my phone and dongle in bluetooth under windows 10 in Bluetooth and other devices settings, saying Dongle driver is unavailable and Galaxy s9+ Bluetooth is turned off.

which was the CSR Harmony Wireless Software Stack. I bought the TP-LINK UB400 Bluetooth 4.0 Nano USB Adapter yesterday got it working perfectly, today I decided to stupidly download the driver for it

Csr harmony bluetooth driver