Thank you so much for your info - my update is on the go now ( RX450h 2022 ).
I couldn't do it for a couple of days - this is ridiculous what we have to do to make it happen.
Lexus garage wanted £192 labour for the update to be done by technician
I knew about fat32, 16gb, even tried to extract files only but would never think about delating .txt file wow
Thank you so much! Artur