Hello! Printing machine Nuvera 288 Xerox. Error 03-3970 low battery nvm. The problem was solved by replacing the new NVM board. After one year, the error resumed, they ordered new boards, installed them. The machine booted twice and won't boot again. I measured the battery with a multimeter 0.6 volts. Replacing the battery doesn't help. Only one section is loaded (there is a 2.8 volt battery), the second section is not loaded. In the service mode, the second section is also missing. How can I restore nvm? On the nvm (960k73400) there is an M48T20 Timekeeper controllerIMG_20220317_111431.jpgIMG_20220317_111443_1.jpg, an M4T28 battery is installed in it. Did someone restore it?