You can bleed the brakes and change fluid in the conventional fashion but old fluid will remain behind the ABS valves and in associated pipework ! I have the latest version of tune ecu , but I can't find an ABS cycle on it . The dealer tool cycles the valves and allows ALL fluid to be changed .
There is however a way around this I have found , albeit a bit of a pita .
Change out fluid in the conventional manner and then ride the bike , do a few quick stops on a safe , straight bit of road locking up both front and rear brakes thus making the ABS work ! Then home and 're bleed as before .
Do this 2 or 3 times and et voila ! Fresh new fluid throughout the whole system .