Hondata

Nothing changed this was in my friends car and when he tried to upload a map dint work so he gave it to me to check.
I updated to the latest software and tried checking nothing works
Checked all soldering and checked with chip tester for all pins
No cold solder all components look good and ...

I have same issue with s300 cannot upload red led keeps flashing
Soldering is all good
Checked with socket tester
Doubled checked with multi meter for continuity
Not sure what is the issue

Software version 2.8.7.0
Serial number : 34805
Firmware : 22

Please let me know what could be the issue ...

Thanks for getting back let me get this information not home now

Hi,
HONDATA TEAM ONLY!!!!!
So long story short
Car runs good when USB connected to LAPTOP
Car starts sputtering if USB is disconnected
Tried another hondata s300 v3 with same ecu works good

Looks like issues with hondata s300
what are the next steps to get this issue fixed
again all grounds ...