Hi

I have read out car above with a clone device with I guess the wrong protocol in boot mode 29F400 512kb.
I saved both files (from both ECU's) and modded it with a couple of DTC's off on ECU 1 and 2 and writing it back, checksum was done by Lsuite which contains KTAG protocols to make the checksum correction (VAG 2001 protocol)

After that car no start with fan on full speed and no comms with the diag tool.

I wrote back the original files  but issue is still the same.

Then i found ME7sum software which indicated me immediatly that file had been read wrong (should have been 29F800 1MB) and checksum is totally wrong.
Me7sum cannot correct it anymore because start adress and end adress is invalid.

Can someone please me with this?

Well ,if you share us sw version. we can provide solution.
My first offer is to, reflash it with ODIS with .frf, .sgo file , but we need sw version!