I was having a problem updating my maps on a Skoda Octavia Mk lll Columbus. M50
The actions that I followed.
Download the latest map update from Skoda portal https://www.google.com/url?sa=t&source=web&rct=j&url=https://updateportal.skoda-auto.com/&ved=2ahUKEwjQ346Cn_nyAhUjDGMBHaGSC48QFnoECBAQAg&usg=AOvVaw2AMlwAz8C-UhbcOTIVoUmQ
Follow the onscreen instruction, model, vin number etcetera.
This is a very large zip file and it took 3 hours, depends on your supplier.
Using a Windows system, I hear that Mac OS gives problems , unzipped (extracted) using 7zip to a destination that I could find again, leave it in your download folder if you want.
Then view this folder and you should see MIB 1 and MIB 2 plus a small text file, if you see another file, that will be a Windows system file, ignore this. Copy MIB 1, MIB 2 and the text file to a newly formatted 32 gigabyte SD card. This could take a while.
Open your glove box, Do not insert your key or press start. Press the large button on the lower left, turn off any media, radio and switch off your interior lights, (battery drain) Put your SD card in slot one and a message should appear on the top of the screen saying Slot 1 software update. Press navigation button, press the setup, then press or touch information. This shows you what your map info is. At the top it says update, touch this and it should go to your slot 1 SD card. Follow any instructions if any and wait. A % counter shows up, my update took about 45 minutes, can't really say as I left it to do its stuff. Then I open the navigator waited a couple of minutes and then took my card out. Working fine.
I hope that this helps.