Cranks but no start after reverse polarity jump start

Jump-started car accidentally reversed polarity.
This blew main power fuse.
jumper leads were left on for five minutes.
The fusible link was replaced, all other fuses okay. EfI relay okay. Cranks has fuel injection no spark. Has twelve volts to coil, earth, five volts ref and earth.
The obd11 codes on engine ECU scan
1300,1310,1315. Cleared codes check system okay. Crank codes returned.
immobilizer scan ok.
Full system scan returned fault codes:
P1305, p1310, p1315, p1656, c1600, P0513.P1013, p1500, Poo13, p0013.
all codes can be cleared successfully, under cranking they all return.
Because of the reversed polarity jump-start and the P0513 code and the multitude of other codes appearing a decision was made to fit a second-hand ECU with transponder and reader.
after installing the codes came back after cranking. Again because of the code key miss match I called a locksmith to verify the transponder and reader were working. The transponder was being read.
It is not known how many of these codes were being thrown up before jump starting but the car was reportedly running fine. Since another ECU with integrated immobilizer is now in place I am ruling out this as the problem.
Any guidance or assistance with this issue would be appreciated.