After days passed my unit writed : SOFTWARE MISSING. Answer: Use recovery method from the 1 question and the So, you can use Web Updater or another manual method to upgrade software version then.3.How can I revert to an older version of the firmware?
The main way to access maps - use USB Mass Storage Device Mode. Then you need to make flash for usual firmware for unit.
You can not revert firmware to older version using method. I prefer usual firmware loaded in PRE-BOOT mode, I hate :)So, download the file use it as I described above.