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 Boot Block Recovery Procedure for Micronics 486 JX-30WB Motherboard
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The JX-30WB motherboard is identified by the number 09-00192 printed on
   the back edge of the board.

The boot block procedure is normally used only if there is no BIOS code
  or incorrect BIOS code in the flash chip - normally resulting in a black
  screen on powerup.
The procedure requires a valid recovery disk, normally created during
  installation of a flash BIOS upgrade. We can provide a recovery disk,
  if needed, at no charge. (Download JX30WBRD.EXE from our BBS)

 1.  Turn system off
 2.  Move jumper W-1 from pins 2-3 to pins 1-2
 3.  Make sure that the flash chip write-protect jumnper (W31) is off.
 4.  Insert recovery disk
 5.  Turn system on  -  Screen should display:
         Flash memory boot block version x x.x
         Insert disk and press [P] for 1.2M or press [Q] for 1.44
 6.  Press Q or P - Screen should display:
         Reading floppy disk
     Should take about 30-60 seconds - then screen should display:
         Flash memory update is done
 7.  Turn system off, remove diskette
 8.  Move jumper W-1 from pins 1-2 back to pins 2-3
 9.  Optionally (recommended) replace jumper W31 to protect flash chip.
 10.  Turn system on, set values in CMOS SETUP

If no response to pressing Q or P, hold down Q or P on powerup so that the
  character is in the keyboard buffer before the boot block recovery
  program starts.
If the screen says "Reading floppy disk" but doesn't complete in a
  minute or so - you may need to temporarily install an external floppy
  drive controller and use it instead of the onboard controller - or
  just repeat procedure. 
It may also be helpful to remove a tape drive from the floppy cable.
If there is only a blank screen after starting system in recovery mode -
  there may be no boot block recovery code in the flash chip.
Also the boot block code will not come up if no keyboard is plugged in.
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   Micro Firmware Technical Support
   Voice 405-321-8333      email  support@firmware.com
   Fax   405-321-8342      WWW    http://www.firmware.com
   BBS   405-573-5538      CIS    GO PCVEND Section 8
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rev 1/26/96 tls