My guess is because the unit sees the software update sitting on the SD card, it’s booting to config mode automagically. I’ve never tried sticking the update on the normal update card, so can’t guarantee that’s what’s happening, but seems likely. The card is only needed for the db updates, it then copies the data to internal storage, so I’d suggest just deleting everything on the card or reformatting it (fat32) to get back to status quo.