Hello Didier, again my fault, 9.2 is correct, so your A5 board has been updated to the latest version already. As it has got 6 EPROMs, your unit is definitely produced before 2001, that also means that the batteries have also been replaced, probably by the cal lab.. Have a look on the serial number, it's probably beginning with 2832A  for HP instruments, produced in U.S., and the following serial count might be 20000 or lower, e.g. 2832A15678. Frank