my BV6000 is got issues on the battery, after update 20170517(via OTA),
my battery charge very slowly.
I fix it for a short moment (1 day) by re-installing ROM 20170517 manually(flashing, following the instruction from either website, I think it from squidstech).
then the next the battery need to charge again(going normal fast charge), I leave it at 100%(I turn off the phone while charging) for a couple hours (because I was sleep).
after that event (left the phone keep charging when parameter 100%), I lost my fast charging again. the charge speed rate only 9%/hour !
the ROM seems unstable, so I will rollback it again to previous ROM