F5 YOUTH (CPH1725) frp failed

[QUOTEWelcome to Octoplus FRP Tool v.1.5.5.0
Platform: OPPO
Selected model: F5 YOUTH (CPH1725)
Please, power phone OFF, press and hold "Vol+" and "Vol-" buttons and connect USB cable.
Searching for a phone. Please wait...
Found phone on COM66
Detecting Chip Version...
HW Chip: MT6763: 0690.0000
HW Version: 8A00.CA01.0001.0000
Connecting...
Brom Version: FF
BootLoader Version: 02
Searching Download Agent...
Selected DA: MTK_AllInOne_DA_Octoplus_Oppo_v.1, n.0
Sending Download Agent...
Operation was failed!
Performed by 1.5.5.0 Software version.

Platform: OPPO
Selected model: F5 YOUTH (CPH1725)
Please, power phone OFF, press and hold "Vol+" and "Vol-" buttons and connect USB cable.
Searching for a phone. Please wait...
Found phone on COM66
Detecting Chip Version...
HW Chip: MT6763: 0690.0000
HW Version: 8A00.CA01.0001.0000
Connecting...
Brom Version: FF
BootLoader Version: 02
Searching Download Agent...
Selected DA: MTK_AllInOne_DA_Octoplus_Oppo_v.1, n.0
Sending Download Agent...
Operation was failed!
Performed by 1.5.5.0 Software version.

][/QUOTE]


is it not supported?

i tried few times it failed