mione E88 frp reset done with Selected model: MTK GENERAL 
Platform: __GENERAL RESET FRP METHODS
Selected model: MTK GENERAL
Please, reconnect battery, press and hold "Vol+" or "Vol-" button and connect USB cable.
Searching for a phone. Please wait...
Found phone on COM16
Port name: MediaTek PreLoader USB VCOM (Android) (COM16)
Detecting Chip Version...
HW Chip: MT6580: 6580.0000
HW Version: 8A00.CA00.0000.0000
Connecting...
Brom Version: FF
BootLoader Version: 01
Searching Download Agent...
Selected DA: MTK_AllInOne_DA_v3.3001.2018-11-07.23:57_458956, n.11
Sending Download Agent...
DA sent successfully
Initializing DA...
Synchronizing with DA...
NAND Flash: not installed
eMMC Flash: .1501004B.37553030.4D084863.746690BF
eMMC Flash: Samsung: K7U00M
DA ver: 4.2.9C
Initializing Memory Flash..
Initialization successfully completed
Sending loaders...
Loader send successfuly.
Reading Flash Info...
EMMC rpmb size: 0 Mb
EMMC boot1 size: 2 Mb
EMMC boot2 size: 2 Mb
EMMC gp1 size: 0 Mb
EMMC gp2 size: 0 Mb
EMMC gp3 size: 0 Mb
EMMC gp4 size: 0 Mb
EMMC user area size: 7456 Mb
Internal RAM size: 128 Kb
External RAM size: 1024 Mb
Reading partition...
Reading info...
Brand: mione
Model: U2
Device: mioneE88
Platform: mt6580
Android version: 5.1
Display ID: Q5_80L_WE_3GW_B15_EMMC_DDR2_64_8_FWVGAP_DX_P35_V21 ME20_Mione 20190530.202011
Searching for signatures...
Resetting FRP lock..
FRP lock is successfully reseted!
Backup saved as mione_U2_02-12-2019_11-01-52.dump file
Performed by 1.8.3.0 Software version.
Thanks Octopus team