Thread: IMPORTANT! If you want HELP in case of a bricked Garmin device, please follow this

I think "Prepare Drive" function in RMPrep is the same as Windows (so called) "Quick Format" where only the card's header is rewritten to mark all space as free and available for writing new data, then any existing data is overwritten eventually. So yes, that's not a full format.

I've looked at your nonvol BIN file. It appears normal when decrypted however that's not to say definitely there's no 'poisoned' data in there, just means there's no obvious corruption.

Let's see if we can dump copies of the firmware regions even though they couldn't be overwritten with the ''xrgn" cmds. Made a fresh copy of Update.txt and open it in Notepad to edit. Make the following changes:
Remove:
del,0:/.System/gupdate.gcd
rrgn,41,1:/41.bin

Change:
xrgn,14,1:/14.bin
xrgn,127,1:/127.bin
reboot

To:
rrgn,14,1:/14.bin
rrgn,127,1:/127.bin
reboot

Before saving it back onto the card, check there's no extraneous carriage returns at start or finish and no spaces at line ends.

Remove 14.bin and 127 bin from the card. It should only contain Garmin\Updater\0972 with the amended update.txt (and optionally update.log).

Follow the previous flashing procedure using Updater.exe in preboot. If it works you should get 2 new files in the card's root, 14.bin and 127.bin, if so please zip or rar them and upload. If it fails post the latest content of update.log please.