I also sent you the dezl firmware (282601000400.rgn) that I installed. Than I rename it Dezl580.rgn and create Dezl580 - cure.rgn. This (Dezl580 - cure.rgn) firmware is now in the device.

When it had the DS 50 firmware or the normal dezl, if I put an SD card with Garmin\Updater\xxxx\ and the files 0E.bin, 7F.bin, 9E.bin, Ldr.bin, update.txt, on the screen 'loading' appears and stops, no longer writing the firmware. Now, if I insert an SD card, nothing happens, but the SD card appears in Windows, RMPrepUSB or Total Commander.

Otherwise it behaves normally, in Garmin Express I can make updates (I can update the map, for example) and in WebUpdater I can make updates.