Here is a stock rom for HK1 max RK3328 4G 32G, that i have received from Transpeed Official Store with dirver assistant, androidtool and video tutoriel:
DriverAssitant_v4.5
https://mega.nz/#!bzYC3QxL!BRtpp2xn0...JAZaAEoc_P9k9o
AndroidTool_Release_v2.59
https://mega.nz/#!u2RQgYjA!CcGyDQxWx...6aAwcWBAOG1DFg
Video
https://mega.nz/#!G6I3xKBb!BZZGeVw5A...cWBEfQ9-QKJjK0
rk3328 HK1 MAX 4G 9.0 firmware
https://mega.nz/#!pEchRIBb!91652-65c...9FVsXy-ra1ik2c
Hope it helps you and developpers to get custom rom for this tv box.
DriverAssitant_v4.5
https://mega.nz/#!bzYC3QxL!BRtpp2xn0...JAZaAEoc_P9k9o
AndroidTool_Release_v2.59
https://mega.nz/#!u2RQgYjA!CcGyDQxWx...6aAwcWBAOG1DFg
Video
https://mega.nz/#!G6I3xKBb!BZZGeVw5A...cWBEfQ9-QKJjK0
rk3328 HK1 MAX 4G 9.0 firmware
https://mega.nz/#!pEchRIBb!91652-65c...9FVsXy-ra1ik2c
Hope it helps you and developpers to get custom rom for this tv box.