oh here is the TG contacts file in case you wish to check the files

I Have similar issue, after I import (another little issue there ill add below) I edit the csv save and import and get the error import error.png BUT if i goto the each zone and use the channel edit and click thru the next channel button on each zone the issue goes away and i can upload. channel edi...

I Have a similar issue, i import an ARC club code plug and when trying to upload to radioddity DB25-d
ive updated to the latest firmware Ive checked the CSV and nothing is apparent to me, exported the CSV channels and double checked it..

Cheers
Mike
VK2ADJ