Hi. In 2017 von Zdenek posted information about the HP 8590/8591E spectrum analyzers. Yesterday I was given a good-looking HP 8591EM Analyzer. The previous owner took out the battery so it has lost all its settings. I also don't have any memory cards. But the rest of the unit looks very good. I will appreciate any information/files/ROM files that can help me get it calibrated again!!! BEFORE I put in a new battery, it showed: 103 Demod 105 Gate Rev B 130 NBW 8591C # 57089 <---- F/W 950914 AFTER I put in a new battery, it shows: 103 Demod/QPD 130 NBW 041 HPIB + Parallel 8591E # 14765 <---- Firmware rev 950914 How/where do I start to restore the settings (I downloaded all the manuals I could find). The EEPROMS are labelled: 08590-80244...7 (AM27C020) The CPU board is 08590-60365 Any help will be greatly appreciated.!!