Old OTA was: BV8000 V0.1_20170803_20171011-0929
OTA updated to, now: BV8000 V0.1_20170803_20180105-1104
No factory reset.
Improved battery life/power.
Charged 4 days ago, Still 2 days left. Power saving Normal mode. At least a 50 % improvement with light use, 2 SIM cards.
--Update--- After 5 days since last charge, I was down to 8% remaining power on the battery, started a new charge; using APP Ampere I am getting a rapid charge rate of 2130mA. This is the same charge rate as before this OTA update.
If you are having problems with charging, use this App or similar to find the true values of the charge the battery takes.