Thread: kenwood dnx9260bt mass storage deleted

Well, so GarminCure3 did its job well. It makes your device enter the mass storage mode unconditionally. Now you can flash the original firmware only by putting your device into pre-boot mode.
In the GarminCure3 [Only registered and activated users can see links. ] it's written the following:

Originally Posted by kunix

WARNING

1. Don't use GarminCure3.exe if you don't know how to enter pre-boot mode. Entering pre-boot is neccessary to flash firmwares after CURE firmware has been flashed.
2. Don't flash GVN-52 and GVN-53 with the CURE firmware, as they don't have a real pre-boot mode.

It looks like you didn't read this carefully and violated the first point. You don't know how to enter the pre-boot mode and flash the original firmware. So it's your fault, not mine.
I really hope lolypop000 will help us with that. I've seen here a few similar kenwood devices which have working normal pre-boot mode.

For example read [Only registered and activated users can see links. ].
This is a success story where GarminCure3 and my removing of region 0x66 did help. And the device looks quite similar to yours.
It was successful mainly because Toretto was able to enter pre-boot mode.

Most probably it's a pseudo pre-boot mode. I think it's implemented in fw_all.bin. And after you flashed GarminCure3-ed firmware it doesn't work, of course.
You need a real pre-boot mode, which is implemented in the bootloader.