Since Blackview doesn't post release notes, I thought this might help those who are thinking about upgrading to 20170708
Changes 20171011
Security patch level unchanged
Baseband updated to moly.lr11.w1603.md.mp.v35.4.p27 2017/08/25
Kernel 3.18.15 recompiled Oct 10, 2017
Build number unchanged
Fixed: touchscreen driver - no more lags and reboot!
Changes 20170708
Security Patch level updated to June 2007
Baseband updated to moly.lr11.w1603.md.mp.v35.4.p26 2017/07/06
Kernel 3.18.35 recompiled Jun 08, 2017
Build number rolled back to 20170412 (not sure why?)
Google OOBE on factory reset (seem to be new for this release)
Additional bundled Google software (presumably to satisfy google certification)
Menu button changed to task switcher in line with Google guidelines, presumably to satisfy google certification
Fixed: Bluetooth and wifi driver fixes, seems a lot more stable (no more Bluetooth drops or Wifi "no internet")
Broken: Bluetooth switches itself off on reboot
Broken: Wifi Captive Portal Error (redirected IP causes a security error in Captive Portal Browser)
Changes 20160517
Glove Mode removed
Broken: Touchscreen driver buggy (lags and reboots when pressed continuously for too long, also triggers reboots during phone call if screen activated with ear pressed against screen or in pocket) Note: FT5406_MT touch panel only?
Changes 20161216
Android 7.0 Update
Baseband supports 4G+3G! Yay!
Broken: GPS time (in GPS Apps) off by 1 hour. System clock is not affected (contributed by BV6000)
Broken: Bluetooth and Wifi Authentication Error/Disconnects (Fixed in 20170708)
Broken: Default Launcher stops (workaround: install a different launcher)
-----
Please feel free to contribute other changes/bugs/fixes below and I will try to integrate into the OP. I will also try to update this thread on new firmware releases (or until I throw the phone away... the touchscreen bug is really annoying...)