Electronics Repair Questions? Ask an Electronics Technician
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I think you should assume that something you take for granted has reset itself. For instance:
- the clerk identity that "is always signed in" is now not signed in
- the programming for 8 % tax (and maybe all other specific configuration) may be gone, if the device has spontaneously (or otherwise) suffered a complete reset and clearing-out of programming memory.
So try signing in as a clerk. And then see (if that works) whether the 8 % tax function is still there, or whether it E / errors out instead of working.