The rest work flawlessly,
What I was did on my Lumia are,
- I run on WP10 TP10080 and I back up All contact, message, and Apps setting, then disable the PIN on lock screen
- I downgrade to 8.1 and do not restore My backup, so it's a clean install
- then I install Windows insider and update using slow ring to get WP 10 TP10149 (because some of bugs in TP 10149 in fast ring already solved in the slow ring build), don't forget to restore the backup ��
- then the last thing update using fast ring to WP10 TP10166
- just be patient during update, do not wait, just let your phone alone for about 40-50 minutes during and after update, (I even can t take a bath and go outside to buy some goods in mart hahaha)
- after TP10166 installed do factory reset, go to setting, about, then reset the phone
- after that enjoy the new TP, I am now using it for daily driver, really awesome ��