Dump full flash

Hi,

I want to dump my RK3288 flash memory into a single image file update.img

this update.img can then be deployed on all the other board

how do i proceed?

I can read the help menu from upgrade_tool,

----------------Professional Command -----------------
TestDevice: TD
ResetDevice: RD [subcode]
ResetPipe: RP [pipe]
ReadFlashID: RID
ReadFlashInfo: RFI
ReadChipInfo: RCI
ReadSector: RS [-decode] [File]
WriteSector: WS
ReadLBA: RL [File]
WriteLBA: WL
EraseBlock: EB [–Force]

there is not any professionnal command working despite the test device one