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Beware of PoE !!!
Download new firmware from the WEB Alphatech, file is archived in ZIP. The downloaded file must first unpack the archive program, for example. "PowerArchiver". The resulting file * .firmware use to upgrade firmware - save it somewhere on your PC, for example to the desktop. On the WEB page IPDP doorphone under Service - Update firmware - select * .firmware select the file and click Save.