Please, I have a problem with my Fluke 192B that it has been in the closet for a while and the battery discharged, after turning it on and charging the battery, I cannot leave the screen at start and close the notification with the F4 key, I can connect a probe to channel A and it seems to work, but I can do nothing else or change any parameter. All the keys do not respond except for the “power” and “user” buttons when they are pressed and activated to reset. Otherwise, the "user" button is also dead. This led me to exclude that the keyboard sheet was a problem and that it had never been used. Has anyone gone through this situation? , I tried to reset the device with the "on" and "user" buttons, I heard the device beeps twice, indicates that the reset was successful, but the button still does not work after performing the reset ,,, any help please,