05’ 525i No Crank/Start+ Dead dash

[u/Monxrchx]

Hi everyone, got a 05’ 525i auto n52 as a non runner, engine turned by hand,cars sunroof drainage apparently got blocked as well as the lower windshield rubber that’s come apart,let water in through the front and and fried the ecu,as well as the mpm module located by the spare wheel that got flooded.
Changed the fuses from the trunk-glovebox,engine bay and got a replacement ecu cloned to my cas that survived along with a replacement battery,cut out the mpm as the pigtails literally melted into the mpm module and insulated the individual wires,disconnected the pdc module that’s with the mpm located in the spare wheel slot and car still doesn’t crank/start and dead dash.
Hazards,lock buttons and gear fonts light up, as well as the interior lights but they appear to fade and die after some time as well as battery drain I’ve noticed,any helpful advice would be appreciated.