แก้ด้วยวิธีนี้ครับ ได้ผล

Restarted Phone
Restarted Bluetooth Device
Went into settings –> applications –> all -> bluetooth share – and clear all data
Went into settings –> applications –> all –> Bluetooth Test – and clear all data

อ้างอิงจาก
http://androidforums.com/samsung-galaxy-s2-t/574552-bluetooth-not-working-after-upgrade-ics.html

แก้ด้วยวิธีนี้ครับ ได้ผล
Restarted Phone
Restarted Bluetooth Device
Went into settings –> applications –> all -> bluetooth share – and clear all data
Went into settings –> applications –> all –> Bluetooth Test – and clear all data

อ้างอิงจาก
http://androidforums.com/samsung-galaxy-s2-t/574552-bluetooth-not-working-after-upgrade-ics.html