Problems with flashing already licenced controllers

[Biodiesel66]

I'm using the latest BB release for almost a month. V8.1, version 2.5.20, bootblock 2.5.08 BB Logging has worked flawless, LBZ and LMM flashing no problems. Tune tool V7.5.4 (build 66) Scan tool (build 67)

Today I tried to flash the stock tune back to a GEN III LS1 licensed ECM.
EFI gave a message that the serial # was missing and needed to do a full flash. What is this? I was able to do the flash and almost rendered the ECM useless. I can only do a full on this ECM now and take about 10. min to do.

I tries to do a Full reflash on LLY ECM that has DSP5 OS flashed to it, back to stock, licenced already. I.m getting the same message the ECM has no Serial # and need to do a full flash to renumber the serial number.

Any flashes I've done to the LB7s. The ECMs have been corrupt, missing vin # and serial #. Caused by a GM tech II reflash I think?

Here's the LLY info

VIN 1GCHK29284E383028
Serial 4327M000015U
Hardware 9377500
Operating System 04166805
Calibration 15246462
BCC DZAN
Operating System 04166805
Engine Operation 15904639
Engine Diagnostics 15879107
Engine 15879102
Fuel System 15879094
System 15282640
Speedometer 15087291


Ross or Paul any comments?

[GMPX]

I'll discuss with Paul

[Biodiesel66]

e-mail aslo sent.

Thanks