Versions like yours before 2.36 have a problem that in some computers makes updating via USB impossible, so for you the way to go is to update via the internal web page. Which file are you using when upgrading? I ask since the "Size mismatch, header size=1347093252, rxd size=162747!" error message indicates there is something wrong with the file, like trying to use the zip-file directly without unzipping the bin-file inside.
