Share your experience!
Hi,
I've recently updated my 6503 to Lollipop.
Everything went smoothly and is working fine, except 2 issues - one solved, second NOT.
FIRST (solved) - phone after update waked up and logged to 2G network, with no data transmission (despite it was turned ON). What was strange - my operator's network appeared in 'available network list' as separate 3 NETWORKS ( 2g, 3g and LTE)
Switching manually to LTE solved it - now phone is switching between technologies automatically, data transmission is working fine.
SECOND AND NOT SOLVED: I'm using the hands-free system built in my car ( mitsubishi lancer, 2008 ) . After update, phone failed to establish connection with it, even hands-free system remained as 'associated device'. OK ... I erased hands-free system from phone, as well as phone from car's memory. Paired devices again - starting procedure from car's side. Nothing better. Erased and paired starting from phone side. Nothing better.
What I've observed more: phone after try to establish connection , phone in eye blink looses it. On list of available services of hands-free system (in phone menu ofc) , only 'phone sound' appears, while -as I remember but i'm not sure- before update more (2 or 3) services were detected .
PLEASE HEEELP ! 
I have the same problem with my D6503 since I upgraded firmware to Lollipop from 4.4.4. Bluetooth pairing is not longer working with Hands free system in my car Mitsubishi Outlander XL 2009Y. I tried different things to pair the phone like cleaning of all paired phones in the Hands free system / cleaning Bluetooth config in the phone, but failed to make it work. At the same time Hands Free system is working properly with other phones like iPhone iOS v.8 and Samsung S4 running Lolipop 5.1. It looks like a well known issue but Sony do not haste to fix it. Did someone get a reply from Sony support?