Failed Software Update.

Followed al the steps and precautions from Huyndai, Failed the update, now I cant go back to the old setting, No MAP no Multimedia,
what to do in this case?, found some info on Engineering mode that might help, but for European version of IONIQ.
Do you think letter for Huyndai will help?

Problem Solved!!!!
The reason of failed upload, was the micro SD card with Adapter! Bought new full SD SDHC from SanDisk, installed same update, and the process continued , Update was success.