I've had this problem repeat itself twice now and not quite positive what the issue is.
Taking a standard E37 ECM from MY09, I performed a few cal flashes successfully. When I load up Scan & Tune V8 and perform a full-flash I get the following errors.
$06FF = $checksumfailure
Any restarting of the laptop & Flashscan V2 has only led to additional errors when trying to full flash again.
$0534 = invalid serial number immediately after attempting
if it will proceed to the next step, it will erase and then send a 'no data recieved' error
$0540 = OS mismatch between 12630187 & 0.
Anyone point out why this failed twice? One ECM was out of an 09 HHR [L4] & the other out of an 09 Silverado [V6]
Is there anyone to unbrick these units? Hate to lose the licenses for them.