AR-PB2 (serv.man2). Boot program Font Flash Memory Upgrade Procedure - Sharp Copying Equipment Handy Guide. Page 5

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15.   If you are upgrading with PB2a flash data, press the Interrupt Key
and now execute simulation 67-18 “Flash ROM Clear” for ARNS1
range.
16.  Press the Clear All [CA] key.
17. If any problems are experienced an “NG” will be displayed.  If this
occurs, press the “CA” key and repeat the download procedure.
18.  After a successful download, turn off the copier and reset the
jumper JP109 to pins 1-2. This will write protect the printer board.
19. Finally, perform simulation 22-05 in order to check that the copier is
recognising the updated flash memory.
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