Hello. I updated the firmware, everything went well, then I updated the firmware of the modem and after the update, the mobile Internet was not available .. resetting the device, updating from the site did not help, I also tried to install the old firmware, in any case the mobile Internet disappeared. when going to the mobile tab, I see an error: 500 Internal Server Error
Sorry, the server encountered an unexpected error.
Failed to execute firstchild dispatcher target for entry '/admin/network/mobile/general'. The called action terminated with an exception: /usr/lib/lua/luci/dispatcher.lua:968: The requested node contains no childs, unable to redispatch stack traceback: [C]: in function 'assert' /usr/lib/lua/luci/dispatcher.lua:968: in function
Spent 4 hours of my time, the router turned into a brick, advise the restoration ways?