There was a problem with the switch Extreme Summit x480-48T this series. After starting Reconnecting and track via COM port (via Putty, minicom).
There may be loaded into BootRom, reset to default (default). But fails to boot further is a process of decompressing .... and so constantly in the loop restarts.
Please tell me whether it is possible in this case, the soft part of the upgrade or reinstall? BootRom not possible to enter a command download image.