[Q] Bluetooth SPP broken after Eye experience / Android 4.4.4 update? - One (M8) Q&A, Help & Troubleshooting

Hi,
I noticed that Bluetooth Serial Port Profile got broken on my HTC One M8 after Eye Experience / Android 4.4.4 update. (Android 4.4.4 / Sense 6.0 / 3.28.401.6 / SDK API level 6.25 / kernel [email protected] #1 / build no 3.28.401.6 CL3...)
More specifically, I can pair bluetooth devices and establish SPP (client) connection, but data transfer to either direction (tx/rx) does not work. Has anyone experienced same?
The other end does not seem to matter, I have tested my phone against normal desktop Linux systems and various microcontrollers with BT/SPP modules.

I managed to solve this. HTC One M8 with Android 4.4.4 does not like if master-slave role is swapped in the middle of connection.
After role swapping the Bluetooth goes into some strange mode and nothing works. If you do the role swapping at the beginning of the connection, everything is ok.

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